Let's be honest, Sid always had that psychotic giant gimmick. He wasn't ALWAYS bad on the stick though. If we want to talk powerhouses who weren't that great on the mic, let's talk GOLDBERG. His best mic moment was eating the contract to start a heel turn. THAT's bad.
I also have to disagree on Benoit. He actually pulled some funny promos, especially talking about what he could do in 24.5 seconds.
My top ten mic head-shakers (random order):
1. Cena: I'm sure if he changed it up now and then he'd come across better on the mic. Unfortunately he only has 2 modes: Quiet sarcasm to start and then the crowd sucking-up "The champ is here!" fervor. Nothing in-between, most of his promos cover the same items with different opponents stuck in.
2. Bret Hart: Bad then, bad now. "WWF in your Hase....House". Enough said.
3. Owen Hart (RIP): "I am NOT....a nugget!". On the mic you were, sorry Owen.
4. Hulk Hogan: The king of unintelligible promos. About the only thing I could understand was "Whatcha gonna do brotha, when Hulkamania runs wild on you". At least Ultimate Warrior was scripted to have that feral sound.
5. Macho Man: Ya know, it's rumored that Ultimate Warrior was on drugs, but I think Macho was on drugs, especially while cutting promos. Only under Hogan because Macho was scripted to be insane.
6. Dean Malenko: I hate to put him in this list but he only had one decent mic moment: when he was feuding with Jericho in WCW.
7. Michelle McCool: I gotta agree with the others who talked about her. At least Layla's voice is bearable... I think it's the accent.
8. Melina: She's hot, no doubt. But her voice doesn't do anything for me. I blame all that primal screaming she did (and still does). BTW, is it just me or was that split thing she did on Fox slightly botched?
9. Big Show: His joke about his butt needing its own area code wasn't funny in the least. This man can NOT talk on the mic as a face. The corniness burns my ears.
10. Rey Mysterio: The underdog promos are getting stale. >.- Need I say more?