A 3.5 -> 4.
I've played through about 8 or 9 games, as clan leader, as minor kokujin, as a daimyo vassal. I'm playing normal, and, I think because I am a bit of a Japanese history buff, I find the game very entertaining. I know that the period was long on war, and short on inter- and intra-clan diplomacy. No clan trusted each another, and intra-clan, the Lord's word was absolute. Additionally, there were very few technological developments. So in all these things, I find that the game is accurate, and for me, accuracy increases enjoyment.
I have seen major clans (20-40% holding) break and splinter into a dozen new clans. I have seen pretenders instigate a clan civil war, and win. I have broken away from my clan leader, and forged a major clan. I have had tightly knit clans, and clans with pieces all over. I have seen plots succeed, and plots be exposed.
I have not mastered the marriage process, and I regularly run out of courtiers.
Suggestions:
*I do believe that the accurate, and innovative, succession model could be more in-depth. I think that it's really cool, between clan leader, heirs, pretenders, and voters, but that it could be more critical.
*I would like to be able to split up my personal retinue, and have more control over who leads what.
*I would like to see the Kori limit be able to expand or contract, even a little, based on leader skill. Maybe one scale based on age (0-10=0, 10-15=1, 15+ = 2) with a second and third scales based on leader scores and on modified leader scores (Master of X + Wife modifiers). So my current guy, Naito Akiyoshi, age 63 [3/9/16] might have 7 kuni allowed, (age=2+Intrigue>15=3+Wife Intrigue>10=1+Master of the Guard Intrigue>10=1), but if he dies, and the successor is an unmarried brat, maybe it falls to 4 kuni.
*I would like to see some visual change to the land with each village improvement, esp. roads, canals, irregation, rice storage, etc.
*Where are the earthquakes and typhoons? Those are every-year issues, (unlike tsunami).
*What about some kind of designation for a place of special interest? Either a place with 'better' metal that might improve swordmakers, or better lands for horsebreeding, even a larger town or city making for a better kabuki theatre. In the same vein, the reason that the Yamato is the locus of Dai Nippon is that it's blessed with gold, metal, and grazing lands - things that not all Kuni were; in fact, nearly all Kuni did not have all three.
*I echo the sentiment of another poster that having some influence on the kokujin in military matters would be fun; the ability to set Clan priorities for attack, for instance, similar to the HoI3 ability to set 'lines' of AI action.
*The colors for the Kuni of Settsu and Izumi are the same...and those of Ise and Iga are too similar, as are Wakasa and Tanba, and Echizen-Kaga-Noto.
*I find the Relationships and Diplomatic map-views very confusing. Some kind of standardized color scheme/schema would be helpful.
*Being able to give smaller gifts to people might expand the early diplomacy options. I have found through many games (considering the time that I've had it - I did buy first hour of first day, GMT-5) the key seems to be to build a retinue fast, focus on a one village, and several castles in step, attack smallers and overwhelm swiftly, then save up for Guilds asap. Once a guild is built, protect it by fortifiying that castle. But at even 6 kori, and a process of expansion, there's nothing left to build in 50-100 years; Masters only then get used for other tasks. (of course, if one starts as a single land Kokujin, there's more diplomacy, etc. at start) But since there's no money at start, the game-flow seems to be bifurcated between trying to do everything at start to trying to plot and position towards the end.
*I loved the HoI 2 detail about the commander's exploits 'Commander of the winning battle of Stalingrad' - and something like that could happen if a battle was A) named, or B) was 'randomly' markered as a Famous Battle (poems written about, etc.) like the Battle of Shizugatake, which might not have been notable at all, except that the loser regained the Honor he lost by killing his family, setting his castle aflame, and then committing seppuku. That's the sort of thing that Sengoku was about. We need that! YOU need that!
*And speaking of, any battle where your troops are defeated should be an Honor loss; any battle where your retinue is defeated should be a larger Honor loss. If your retinue wins, well, it's supposed to, no Honor gain. But if your retinue is outnumbered AND wins, the Honor gain should be in line with the degree of outnumbed, and the quality of troops faces. Retinue v. levy, not so much. Retinue v. rebels, even less.
*Any action that requires Honor should have a gain if successful and a loss if not. So I ask for a marriage - it should cost something - HONOR! If I'm clan Lameo, and ask a Yamana Princess for her hand, it should cost more Honor, and if rejected, come with an Honor penalty, in line with the target - a Yamana Princess should carry more penalty! But if it's accepted, then I should gain back some of the Honor that I paid for the asking, and in the case of Lameo Tomo, should actually result in an Honor gain! (Asking anyone= -1 + target clan has >100% more honor (total honor of all Kori holders) than your clan = +10 + target of action (marriage in this case) has >50% more Honor (total honor of target+leige+spouse+masters) =+5 == total Honor cost for Lameo Tomo to ask Yamana Princess is 16 and if Tomo gets rejected, it could cost an additional 50% = 8. But if he's successful, then maybe he gets it all back, or all back +25%, or something. Could be formula driven, but Honor is and was the essential currency; and that's not enough of the game.
*What about some 'events' options that were perhaps not historical, but might make for some great twists? One could enable the chance for these though the options screen, for instance, and might involve some diplomatic/military events with Korea and China, or additional involvement with the Dutch, Portugese, or other European traders, legendary swordsmen (Where's my man Bizen?), those darn Mongols, pesky Ainu, or even some kind of Oni incusion?
So that's 14 suggestions. I hope that 1) you read this! and 2) that the suggestions are helpful and 3) that you're already implementing them.
Ok, I have to get back to trying to destroy the EU through currency manipulation, shorting Greek, Italian, Spanish and Finnish sovreign debt, and pushing up the stock of German and French companies that are run by folks who oppose another bailout for the Greeks et al. Wish me luck! It's kinda like Sengoku - trust no one, plot against everyone, and go to war.