I'd say pyro is my most played class, for me it is the most fun to play, esepcially using the backburner against noobs who never cover their rear. Flare gun is also fun, especially if you manage to get someone on the other side of the map and they have no idea where the shot came from.
The spy is also a fun class, requires a bit more skill than the pyro, and with the Cloak and Dagger, can make it quite tense if you are caught out in the middle of an open area invisible, but unable to move due to lack of power.
Personally, the class I hate playing the most is the medic, pretty boring for me, and the demoman,mainly because I'm crap at it. Its always seems like a little bit a of a cowards class to me. Saying that, I often get killed by them as well, so that might have something to do with it.
The spy is also a fun class, requires a bit more skill than the pyro, and with the Cloak and Dagger, can make it quite tense if you are caught out in the middle of an open area invisible, but unable to move due to lack of power.
Personally, the class I hate playing the most is the medic, pretty boring for me, and the demoman,mainly because I'm crap at it. Its always seems like a little bit a of a cowards class to me. Saying that, I often get killed by them as well, so that might have something to do with it.