Seems to be getting pretty good reviews, tempted to grab it while Steam still has the DLC bundeled in. Only problem is I'm so poor at the moment.
Did you play King Arthur rambir? I get the feeling that this is a bit simpler than that but in a good way. Do they still have the text based questing? And how is the unit balancing, that was Arthur's greatest weakness?
Well, to me KA greatest weakness was not it's unit balancing (athough the christian side did seem a bit weaker then the old faith side), but more about the AI cheating during the campaign.
The beauty about Lionheart is the AI cheating seems very minimal as it's not like KA at all in terms of turns of an open campaign map. Instead, with Lionheart, you get a map and then you just pick provinces one at a time, and play a battle to conquer it. There is some minor back-tracking where sometimes the factions will ask you do the missions for them, and in turn it can port you into a battle.
The battles themselves in Lionheart seem a lot easier then KA, I'm playing on normal but my crusader units seem like their Spartans at Thermopylae, lol.. As a lot of times my kills to unit ratio against to the enemy is insanely high in my favor. (As it seems your always outnumbered in the battles, but your units I guess are better to compensate the outnumbered stuff) Also, the battles last longer in this game then they did in KA, since the enemy usually brings way more units then you.
As for the adventure quests which were really cool in KA, unfortunately there is none of that so far it seems in Lionheart. Instead, what replaces that are historical/semi-historical event choices that you pick one option which in turn will give you fame with one of the factions and more fame you unlock with a particular faction, eventually, you'll unlock bonuses and units from that faction.
So overall, a very different, yet similar game then KA, and still enjoyable in a different way then KA. I will say though that KA did feel a lot more open ended then Lionheart, but the battles I think play out much nicer in Lionheart. I just hope eventually a rotate camera from the edge screen becomes a viable option, as the rotate camera features so far in Lionheart is not that good in my eyes.