I generally avoid cheap maneuvers. I avoided using Machine guns in MAG as I felt they required too little skill. Seriously, they are nearly as accurate as an assault rifle, but have more damage, and about 3 times as many bullets. The only trade off is they are less stable, take longer to reload, and can't use 4x scopes, silencers, or noobtubes. Not nearly as bad as it sounds in a squad based game.
I have used item copying cheats in a few RPGs, but I generally avoid it. I've been cheap in a few fighting games, but I dare you to show me someone that hasn't.
Honestly, I avoid cheating. Probably due to one of the first cheats I ever used. Back in the original Sonic the Hedgehog game on Sega Genesis I used a code that gave Sonic a super jump ability. You could basically jump over whole levels. Then, I got to the water level. You had to go underwater to complete the level, but by activating the super jump code Sonic couldn't enter the water. He just kinda bounced on top of it. And I don't think there was a way to turn off the code without restarting or turning off the game. Never again. Never again!