I've played a bit here and there of this game and must say...well, first, I am a big fan of the series and have enjoyed playing/modding all of them.
Now, with that said I was very excited when I read about Medieval, always thought the Sims format would translate well to an RPG, but my biggest complaint is this whole "quest" concept. Yes, they are neat, you have objectives you must perform in order to complete the quest, which is pretty cool, some quests can only be performed by certain "Heroes" (Heroes are your created sims you assign to positions though out your kingdom). So, if the quest is something like, "Expand the Kingdom", then your King/Queen sim is the only one that can take on this quest. Again, this can be pretty fun, the bad thing is, I've played for near 8 hours now and have only had quests available for my King/Queen...even though I took all the time to create sims for other positions in the kingdom.
Another feature about the quests I do not like, when you complete one, that's it, the game gives you a summery of the quest, your performance and then bam, your at the kingdom view where you can "build" (this is pretty much pick what building you want and there it is) new structures or take on a new quest. Gone are the days of "open ended" sims play, which for me was the big draw, I loved being able to start a new town, create a bunch of sims, then take on the role of one of them and live his/her life.
The game actually feels more RTS like to me now, you've got to plan out your interactions a lot more...if you want your King/Queen and the bard to hook up, you'll have to plan your time out rather quickly...see, you rarely get "down time" when doing quests (and as I said, there doesn't seem to be any open play), which wouldn't be all that bad, except somethings have a time limit, if you do not complete a goal (not the in game term, can't remember it) you lose motivation, motivation is everything in Medieval, where as in say Sims 3, if you wanted to boost your spirits, you could complete one of your sims wishes, or needs (whatever it was called, haven't played in over a year), but you weren't required to per se.
Any how, I'm still really early in the game, it plays great, looks great, though I did notice a modeling issue where the neck and body come together, you can see the seem, but over all, it's a good game.
Take care,