If you think Sheamus is an 'awful' mic worker you need to lower your standards a bit.
That's the problem with fans today. You shouldn't BE lowering your standards, the wrestlers should have to work until they reach your standards. Too many people are willing to just gobble up what WWE throws in their faces.
10 years ago, mic work was crucial. We used to have Austin, Rock, Foley, Triple H, Kurt Angle, Chris Jericho, Undertaker, that's what a top star was. Now it's Sheamus, Dolph Ziggler, Daniel Bryan, Randy Orton and Ryback, among others. The only top, top act who can perform at the level of a world champion is CM Punk, and John Cena IF he ever decides to take anything seriously, the rest are not deserving of their positions. They aren't good enough, and that absolutely SHOULD bother you.