I can confirm that all Chaos Marines are cheating. Real Astartes rely on their faith in the Emperor and their holy Boltguns. Chaos Marines have all kinds of cheap tricks like mutations, unholy assistance from the Dark Gods, daemonic allies. It's really just not fair.
Hey, if daemons just show up and kill your enemies, that's not your problem. Only Chaos would stoop so low to actually ask for help from the immaterium. Because they're cheaters.
Chaos are just playing alot better because it's their campaign. First time I've ever won 5 attacking siege maps as a pub. That plus the usual lag, bugs m,akes it seem like cheating.