All of this is nonsense, because people don't boo bad performers if they're heel, it's just an IWC smark un-written rule or tendency almost. People will boo a face if they hate his work, but never a heel for the same reason.
The Miz I believe is a "natural heel"; nobody can tell me he wasn't getting real heat in 2011 when he was main eventing. I believe a facet of these "natural heels" is their affinity for being annoying on screen characters, like a Skylar White/King Joffrey type, or doing downright despicable things, and that's a personality The Miz plays perfectly, from his face to the way he talks to his catchphrases. How is "Really?" a worse catchphrase than "Excuse me"? Yet everybody gushes over how much heat Vickie got from saying that. And to the people claiming Miz ain't getting a reaction right now,

He only returned 3 Raws ago, let the crowd re-familiarize and adjust first before one can try to gauge a reaction. Miz wasn't exactly on top of the world before he returned so it's not like he'd be getting super heat the moment he comes back anyhow (and despite that he actually was getting a lot of groans and moans from marks and smarks alike when he returned)