I'd admit to thinking that knees to the head of a downed opponent is perfectly fine, as early Pride showed it stops stalling. There's little difference between kneeing to a downed fighter than kneeing a fighter in the clinch.
Soccer kicks & stomps are crazy & should not be allowed. At the end of the day I like mma, but I never want to see a man on the ground getting his head literally kicked in. This is taking the sport backwards, beside the fact that nearly everyone who uses soccerkicks & stomps cheat to do so. Any time you watch a Pride fighter give a soccerkick/stomp you watch as he graps the rope to stabalise himself.
Elbows again are fine, however I can understand why some people don't like them as most of the time they just cut the opponent open, but then that's why referees & doctors are at ringside to check the cuts aren't dangerous (except in the Edwards fight, when it was fine during the fight to continue, but not after the round ended???)
Anyways that's my take.