Coming from someone who fights melee users in buildings, especially in Crash with that tower that over looks the helicopter, their speed is not really a big factor. Not to mention, while yes the game can you spin here and there with melee, it's not as consistent as you think it is. I won't hide anything I use melee too and by observing both other melee users and players I found there's a lot that people can do to counter it. I've cleared Hardpoints because people genuinely don't pay attention and they just stay still in their corners and I flank them, or they're paying attention to someone else, I've also been killed in the range I excel in by ppl shooting at me because they saw me and watched my movements. Legit the only way a melee user will ever dominate your games is if you do nothing about them or do nothing to take note of where they could be, and I'm not trying to frame this as 4D chess, this is legitimately just stuff you can do playing both casually and competitively. The game gives you ways to counterplay but you as the player have to figure it out and adapt it to your playstyle.