there may be balance and optimisation issues, but they will be fixed eventually and the game is really growing on me.
there are alot of important redesign of vs previous TW game mechanics, such as recruitment and public order. old public order system was completely broken and exploitable by what I called tax fluctuation. and nice additions like all the different types of buildings/cultures, its just way more vast. overall a inteligence balance of simplfying boring gameplay, ie managing recruitment from each town, controlling up to 15 agents. and adding complexity to interesting parts of the game, siege, buildings/tech, cultures, pollitics etc.
would take me too much effort to list and explain all the nice changes rome 2 has, id rather be playing. But I think eventually it will be impossible to go back and play older TW games.
there are of course negatives, for instance the victory conditions seem crazy high. you get choice but 110 settlements is a fucking lot! needs a "short campaign" option like in shogun. game also seems alot easier altho I'm yet to play legendary but I won't want to until short campaign because it will just be too much fucking effort to take 110 settlements off full stacking AI cheaters.