Nope, from memory he sucked as a heel too (then again, he was playing that chickenshit heel from memory [at least he was during his feud with Orton, which aside from that time he fought Ryder for the title, is all I remember from his reign . . . which isn't a good thing because that means he was forgettable just like his face character [which is what, an irish Cena?]). I don't think this is a case where changing alignments is going to change the quality of his mic skills, which aren't that good in my opinion (I don't really want to call them bad, seems harsher than it actual is). I've even seen promos from him when he was doing that O'Shaughnessy (no idea if that's correct but I'm in the ballpark) and aside from actually having a hint of character, I didn't really think they were any better than what he's been providing now.
That said, he's still good in the ring and capable of having great matches so I don't have any problems with him specifically. Well, I do but not that problem. Like him yelling Fella before doing the Brogue Kick on several occasions, that's Blue. Uh, but what I was getting at was his booking hasn't really affected my opinion on him in anyway. I normally take those problems out with the bookers and of course now I don't even watch WWE unless it's PPV. Suffice to say, a heel change isn't going to get me interested in Sheamus when I think he's pretty bad at portraying a character of interest in general and especially not when I'm not even interested in the company as a whole.