Soldato
Getting all 3 flags usually ends up with being counter-dominated in like 30 seconds because of the spawns, it happens all the time.
Another rage quit moment for me especially if I have spent most of the match going heavily negative to just get a sniff at B to capture it when we are up against a good team. That one player that takes the 3rd flag has destroyed all the effort we as a team put in to the game in one action.