The good:
- The number one most addicting hat simulator game.
- Free to play.
- Work together as a team with either complete strangers or your best friends.
- Huge trading world within the game.
- Constantly updated with new features and in-game items.
- Hats: you gotta love 'em.

The bad:
- Could cost you a lot of money (Valve knows how to seduce you to buy their virtual goods).
- Having people in your team who don't know what they are suppost to do can be pretty frustrating.

The verdict:
Just play it. If you don't like it: remove it. If you do like it: upgrade your account to premium to be able to do some trading and to be able to get yourself some nice hats and miscs.