Well, even though it's still pretty early, I enjoy what I see and hear so far. I like the notion of Sheamus attacking Bryan & Ziggler, and I quote, "because I can" as it's a simple way of getting him over as a jerk. Quite a bit of the time, simple is usually the way to go and it's easy to dislike someone who does things because he/she can and gets away with it. He's not trying to play coy with the fans by condescendingly trying to convince them that he's doing it for their betterment or that he's really a nice guy or anything along those lines.
As far as Sheamus' "where have all the real men gone?" statement, it's sort of along the same lines as what Batista was doing at this time last year, only Sheamus has a few things going for him that Batista didn't. One of those things, in my opinion, is that he's a much better overall wrestler than Batista whether it be on the mic or inside the ring. Sheamus' new look is also garnering heat, heat that he encourages and wants while seeming completely, 100% at ease with the "you look stupid" chants. Batista got some heat as well, though it was mostly go away heat as not a week went by when I didn't see people from fans to writers to even a few wrestlers raggin' on Batista for his skinny jeans. Hell, people wanna see him each week just to be able to chant "you look stupid" if nothing else. Sheamus is trying to look tough, while a little ridiculous at the same time whereas Batista just comes of looking like a complete tool. He seems calm, cool and collected, generally far more at ease on the stick than when he was a babyface. Another advantage Sheamus has going for him is that he didn't quit for almost four years before coming back and all but literally handed the main event of WrestleMania on a silver platter.
Sheamus' "real man" comments are also a way of sorta striking back at fans of Bryan, Ziggler or other "smaller" guys, thereby garnering heat for himself as a heel and getting fans to rally around the faces. Not that Bryan and Ziggler need any help in that department, but any little bit helps. He's doing what heels are supposed to do and he's going about it in a simple, old school way that almost never fails: target extremely popular fan favorites while acting like an asshole willing to back up what he says.