I just played Team fortress 2 and...

What do you mean?

Playing Engineer is easy. Just build a Dispenser near a corner, then a sentry in the middle of the room, then get a Heavy/Pyro to stand next to your dispenser and unlimited bullet works.

Engie isn't really too hard. You might as well be playing a tower defense game if you plan on playing Engie. Offensive Engie is fairly difficult though, at least to me.

Personally I would say the hardest classes are Scout (takes the most reflexes and mechanical skill) and Spy (has the largest burden of knowledge required for all classes).

I personally like Pyro because burning things is fun.

I prefer any class but engy...

I'm best with Scout, Sniper and Spy...

I play as a Huntsman sniper. I suck, but I have fun.

I enjoy the scout and being a battle medic the most, Spy is pretty fun and off engies are hilarious. Not a fan of demo or soldier (not my style).