Demoman. Always. Unless there's an absolute need that I go another class (or I've been playing demo for hours on end), always the demoman. The JONES boys recently got a taste of my splody powers.
Medic! I love being the reason 3 guys can push becasue im keeping them alive, or shooting up an uber to change the outcome of a stalemated battle, and I love being extremaly important during Sudden death. Secodnly would be Soilder... >.> <.< Hints my name.
I love soldier. i feel the scout's shotgun should be weakened. way too powerful for a class that is suppose to get in and out, not be the ultimate offensive weapon.