Vickie Guerrero hands down. Go to an arena show and try having a conversation with your friend while she talks, you can't. I can't say that about anybody else in any pro wrestling promotion currently active in 2011.
First of all there are far too many shitty heels on here. AJ Styles still gets pops. Flair gets pops now too. Wolfe hasn't even been around for months. Jarrett has always been a good heel. Swagger gets X-Pac heat. Jeff Hardy can't cut a promo. Dolph Ziggler gets all his heat from Vickie Guerero (Who also gets X-Pac heat) Barrett gets pops.
Besides garnering heat among 800 people in the Impact Zone and thousands in a WWE arena are two hugely different things.
Vickie and it isn't even close...after that Punk followed by ADR, Sheamus and Wade Barrett. As far as WWE goes. In TNA it's Ric Flair, besides that atm. they have good but not great Heels. Ric is the only who makes me want to punch him.