The thing that annoys me still the most about Crucible is the darn tiny mesh inconsistencies of maps.
Tiny object on the wall? It can block your movement. Tiny object on the ground? It can block your movement. Tiny object of a door frame? Can block your movement. Some fabric stuff being solid while others isn't? Yeah, that can block your movement as well...
It's so annoying. I know this will never get fixed, but man... The amount of deaths I have because I get stuck on a tiny object! It's so stupid.