The Miz face turn was the shits, but that's because they did it several years too late and with the worst possible foil in a heatless ADR. I contend that if they had done it right after he lost the World Title, with that smug jock-ass Alex Riley turning on Miz, it would've worked out.
Before you argue that Riley wasn't exactly a ball of fire, well, that's true - but remember, Miz had everyone thinking Damien Sandow was something special, and look how that turned out the minute Sandow went to TNA without any character, personality, or WWE bag o' tricks and was completely exposed as average in every way.