I know that sounds really buzzy, but I'll explain! I promise! Hey, put that stick--wait, what are you--
I finished Assassin's Creed 2 last night. This is the part where I brag. I collected all 8 statues (I'm rich biatch), all 6 tomb crests (to get the assassin's armor), all the glyphs, all the feathers (only had to look up 13!), and I only have four achievements yet to get. Still trying to decide if I want to get all the treasures.
Anyway, while playing Assassin's Creed 2, despite avoiding FAQs almost entirely, I found that the internet played a major role in how I played the game. As I played I listened to podcasts, watched videos like Co-Op, and read tweets from a variety of gamers that I follow.
While people were good about keeping spoilers and direct cheats out of the game, I found lots of little stuff I might not have looked for otherwise.
For example, knowing that the DNA menu in the game shows how many feathers you've--excuse the pun--plucked out of each district is absolutely instrumental to finding all of them and winning the achievement.
Without all the information I pulled from those sources, I would've never checked out the UPLAY menu, which got me the Altair outfit (purely cosmetic), or access to the Auditore vault. This is a free dungeon won using UPLAY points gained in-game. It's mostly just history about Ezio's family, but it's free additional content and that can't be overlooked.
There are also moves you can use in combat that aren't in the standard tutorials. Using the absolutely absurd amounts of money you make from your villa, you can pay the combat trainer to show you the moves if you want.
I don't feel like the game itself was lacking or should've told me these things, but rather I feel rewarded for just being involved in the gaming community. Along with Uncharted 2, this has been a very good year for scrambling up the sides of buildings.