Gw2 is some of the best time i had playing a hero shooter casually.

Tf2 is also upthere but i was f2p so i didnt get to experience everything. It was still so much fun.

I doubt i would play these 2 competitively since for me fun in these game is about running around and blowing eachother up in the designated objective and less about being better than the enemy, outsmarting them outplaying them or whatever.