I've played quite a few games this yeah that have been good, but nothing that's absolutely outstanding. Still, Skyrim is probably the best of the bunch so far (though admittedly my Skyrim experience has been tarnish by this new Nvidia engine not working for longer than 30 mins in game before crashing my PC). I've always been fond of Assassin's Creed so hopefully Revelations will put up a better show.
EDIT: Actually, come to think of it, I had a lot of fun with Human Revelation, so maybe that instead of Skyrim
EDIT: Actually, come to think of it, I had a lot of fun with Human Revelation, so maybe that instead of Skyrim