I've played the first Assassin's Creed on my PC and the rest of sequels on my PS3 until now. Firs of all if you get the PC version you will get all the exclusive single-player missions that includes what are exclusive to PS3 as well. Another tidbit is that the PC version has been released with latest patch which fixes a lot of bugs and is of course graphically superior. Yes Ubisoft has said textures could look twice and some cases four times better.
Now let's talk about the game. This is the first time I am thrilled and excited to play Assassin's Creed game since the first game. Do not get me wrong the Ezio trilogy were great but it felt samey. There are so much new with this game. I am going to skip on naval warfare, hunting animals and bigger missions. The most impressive is how the game plays and looks. Many developers including Crytek, DICE and now Ubisoft upgraded their engine for next gen while it runs on current gen. This completely shows with Assassin's Creed 3. Aside from Borderlands 2 this is the most improved sequel this year. Connor climbs structures that includes trees very organically and combat which i do not know is due to excellent animations or what, is more fluid than ever before.
The first time you play as Connor is the same feeling as Altair in the caves back in Assassin's Creed is completely different than anything else.
I don't understand reviews from various publications giving this game 8-8.5 score. It's not game of the year but definitely a runner-up.