I was extremely interested in this game until I actually heard more about it. While they did add a whole new dynasty and several decades of story, the story mode was still cut short for every kingdom - in one case, even shorter than before (Wei's story ends at Fan Castle). Also, story mode battles can't be played as any other character besides the pre-designated one which is a huge drawback. Conquest mode sure sounds like lots of fun but the fact that I can't freely play story mode battles as any character pretty much kills the game for me, as much as they've otherwise improved.
On the other hand, I'm fairly confident they'll be able to fix what's broken without breaking too much more in the next game. Unless they're more stupid than I imagine, they ought to have noticed what most complaints are about so it should be impossible not to fix them.
So yeah, as much I'd love to get the game, I don't think I can really afford a game this broken. But that's just my opinion, I can see why other might actually like the game.