Cheats ruin the game. I try to avoid it especially when I'm playing against someone on LAN.
Ha, you said "try"... :P
I do the same. If I'm playing a game to finish it, I don't use cheats, even after beating it several times. If I'm playing a serious MP match, I don't use cheats, even if I'm losing badly. But they do have there place.
I've had a blast playing with cheats in MP matches, as long as everyone is doing it. It can sometimes be more fun using cheats in a LAN game than a solo one. I do it to unwind after particularly difficult matches, to test content I'm developing, or to practice.
It's a lot easier to practice rocket jumping in god mode. :wink: