I can't believe no one's mentioned him yet... Arn Anderson. The man had no gimmick at all, he just walked out there calmly and whipped his opponent's ass from turnbuckle to turnbuckle. Arn and Ole Anderson are still one of my favorite teams of all time (remember how they whooped the previously indestructible Road Warriors?). I still mark out whenever I see him on tv, even though he only says on or two words before they focus on someone else... dammit. The guy didn't need a catchphrase, gimmick or props to get over like many other "greats" of the business. Arn was Arn, and dammit that was enough!
A friend in need is a friend indeed, but a friend with weed is MUCH better!
I've personally been thrilled with how well Big Show's been booked - and how he's stepped up to the plate - since he moved to SmackDown. He's really been trying, and he's finally wrestling like a 500-pound monster should be.