One thing that always bugs me about people saying "just focus the heavy" is you end up wasting so many shots on a heavy that is actively playing a bit back/trying to survive, that the rest of the team just steamrolls you. or conversely, if you bring the heavy in late, people are so low ammo/unprepared for it that the heavy ends up cleaning up (unless there's a lot of shit to hide behind). It's not overpowered by any means, but it's not fun to play against at all, and it feels to me that heavy is usually the best for an uber push/defense on like majority of the competitives 2nd points/last points. I agree with the last points though, warmfront is an issue, but I just can never really understand why people are so defensive over heavies when they almost always slow the game down. But then again when I last played competitive, we were running 2 natasha heavys on gullywash, so it may be some residual hatred for it :D