I've had about 3 of them now, some of the people you see walling on casual are so bad. I saw one guy on assault trying to awp people through the roof as T. I ended up with more kills than him on the CT side in the end.
Theres also times where the other team are so up their own ass they cant tell the guy on 20-2 getting constant through wall headshots isnt wallhacking and it takes like 2 games to kick them