Demo Man

-Using the timed grenades isn't too good unless you're just spamming. Use the remote ones (5), so can time them to hit your enemies.

-Put a bunch of remote bombs under your flag and set them off every time an enemy goes for it. Works most of the time when the flag covers them.

-Also try setting traps at choke points as a great line of defense.

-Set your detpack to blow away some obstructions that obviously lead to another path.

-This is the class you really want to be as soon as you join the game so you can clear out any blow-away walls.

-This guy is somewhat fast, well not really, but he's not bad for flag runs.