I really liked the first game, and love this one even more.
I really enjoyed the first game, didn't mind the repetition others did, but I definitely saw the room for improvement.
Well in this second installment they greatly expanded on the types of missions available as well as the story that goes on underlying it all. Very well done.
They also upgraded the time spent out of the animus which actually gave me a head ache to play in the first game. Now it was much better done, although I wish for more Kristen Bell time! :)
They added in a couple Tomb Raider type sequences that were very enjoyable, but unfortunately highlighted the wonky controls. They need to tighten the control up if they are going to continue down the Tomb Raider path so the seemingly random control responses don't frustrate so much.
In Summary: Really enjoyed playing, and a major step up from the last game that I already enjoyed playing. Glad to see they didn't mess up what was so charming in the first game while improving the second like so many developers seem to do.