Kinda glad I didn't pick that up based on impressions, despite liking AC2. Unfortunately, the public didn't seem to get the memo because its sales are crazy good so we'll probably be seeing more stuff like AC3 for the next few years.
As I said before, I haven't played the first two, but I'm really enjoying the third one, despite the shortcomings. Maybe the Wii U version really is better than the other console versions, the better map and controls might help a lot. Some of the "GTA" missions are more fun than GTA because the controls are slightly better, and some of the "MGS" missions are better than MGS, because the environments are a bit more interesting. Some of the missions are a bit too random for my liking, and I usually haven't bothered replaying the missions to get 100% syncronation.
And one of the things I don't fully get are the fighting controls. Sometimes I can button smash and quickly kill 10 enemies that are surrounding me, but sometimes they overrun me surprisingly easily, even when I'm trying to time the attacks correctly.
Taking over the forts has been pretty fun, but looks like I only have one left in the game. And I even enjoyed the naval missions I have done. I'd like to see the old Pirates! game redone with this gameplay engine. The sea battles look great, especially consering it's not really a major part of the game.
If I'd have to give this game a review, I'd give it 9 out of 10, if it can keep me interested till the end. If not, maybe an 8, but let's see.