First time completions of my raids were 100% legit. I pushed of Atheon once. Never put crota on the knee. Cheesed the hard crota bridge a heap of times, and the oracles in hard VoG. Honestly I've never thought cheese was necessary, it's mostly just who you play with, and what they want to do. Guys who suggest cheesing straight up in every possible encounter, aren't usually the ones who are invited back.