sniping in tf2 is harder in theory, but sniping in go is enough easier that the best awpers in the world are expected to have ungodly high hit rate and to take their shots ridiculously fast
plus the player pool is obviously bigger so the likelihood of having lots of god-tier snipers is higher
I guarantee that kennys and guardian would be like top 5 snipers in the world in tf2 even tho its a different game