I was playing as Russia and when I had to fight a second great war against China, the UK, and Japan I contemplated just turning the game off.
Because the combat system in Vic2 doesn't resemble anything that a sane person would consider fun.
"BUT VICKY 2 ISN'T A COMBAT GAME!!!111ONEONE11!ELEVEN" you say? That's all well and good but just because it's not a war-oriented game doesn't mean that the combat should be so bad that I deliberately try to avoid war at all costs.
The problem is that it uses the EU3 mechanics yet the EU3 mechanics don't make much sense for more than half the time period. Also, what's with forts not giving a defensive bonus? They just make it longer to siege the province? Absurd!
The system, if you're a gamey player, is easily exploitable. Meet their superstack with yours, encircle, done. If you don't choose to do that, you resign yourself to a glorified game of whack a mole, moving your armies from province to province to beat their armies and to chase after their retreating armies again and again and again and again and again. Have frickin' mercy.
It's just not fun. In my wars with China, they sent little armies of 3-18k men to occupy provinces while I was decimating their bigger armies. Not only did that ultimately doom the chinese war effort, it made fighting the war incredibly unfun for me because I had to painstakingly destroy each and every one of these armies. I almost wished there was a button similar to the one for "automatically attack rebels" except it was "automatically attack hostile armies".
I'm not trying to bash here I'm just trying to tell it like it is so please don't be condescending (I remember when the devs and fanboys would talk down to people who criticized the Great War system but low and behold, they ditched it and got a new one LOL). The combat in Vicky 2 is horrendous and makes me NEVER go to war unless I know I won't be fighting much. I'd pay over $50 for you guys to implement the move=attack system from the HOI games (and nearly $100 for a proper converter but that's besides the point).