Wikis dedicated to specific games are usually hit or miss and there usually isn't more than one good wiki for each game. TF2wiki.net is one of those good ones that hits the nail on the head. Featuring a MediaWiki layout (Wikipedia) the main page offers you most of the direction that you are looking for when you first hit the site. And the articles themselves are rich and full of the content you want if you played TF2.
As a TF2 gamer, there a few things I look for when browsing a strategy site. I want to see information on classes and maps readily available. On TF2wiki.net these are the first things you see when you hit the main page. Clicking one of these articles brings you a lot of detailed information, including all the secrets and even videos of gameplay. Also available is the "Featured Article" section which leads you to portions of the site that you might not have otherwise seen. And the "Did you know?" section offers random tidbits about the game that even a veteran like me didn't know. The only drawback of the main page is the set width. Only at 1600+ resolution will the entire page be able to fit on your screen.
You can usually tell a good wiki by the use of the discussion tab on articles and the TF2wiki.net community really seems to know what they are talking about. Overall, the site is an asset to anyone that plays TF2 seriously as it will certainly improve your game.
Check out the www.tf2wiki.net page on TruthGaming.com.
