I think it looks incredible. It's everything good about Assassin's Creed 1 + new stuff that seems great - everything bad about AC1 (+those dull looking glider sequences).
Other than those glider sequences, everything looks super great. Assassinations seem a lot more creative now. In one of the videos, you can drug a target's body guard and cause them to attack anyone near them like a lunatic; you can even throw gold on the floor near them and get the filthy poors to get caught in the frenzy. In another part, he hired goons to fight guards, then just walked past that entire battle. Well, the linear platforming sections, which were compared to PoP, could be great, but who knows.