I saw one guy who was using some cheat to make himself invisible. So when he was defusing the bomb I tried shooting everywhere in the vicinity, but didn't hit anything, so I guess it just makes him "not there". Also, the guy could rejoin his team right right after dying, so he could die multiple times in the same round. At least I got to kill him three times in the same round a few times🙂
And then there's those punks that scream cheater every other game:|