I agree with you on Estrada, the dude is average at best. Not sure about the whole "Umaga = Abyss" comparison because it wouldn't be long before WWE fans are thinking about Umaga what TNA fans think about Abyss: Why don't they ever step it up? (Although I suppose that question about Abyss was just answered).
Isn't the whole point to being a manager in WWE is to over react to everything? The thing with Estrada is that he has all of the tangibles together: He has the look, gimmick hat, gimmick suit, gimmick accent, and everything is so absurb to a point that you can't help not to laugh at everything he does.