Pfft, the Jedi are all a bunch of wussies with their heads stuck up their asses. They couldn't even realize the galaxy was being controlled by a Sith lord, morons. Not only that, it took another Sith lord to defeat Sidious. Luke couldn't do it himself. Then again, it's not like the emperor played fair, but when does the bad guy ever play fair?
If I were a Jedi, I'd probably be like Anakin, only skip the walking iron lung phase. I'd wear it to parties though.
My appearance would not deteriorate either. Face it, the dark side is cool. It's fun being bad. I'd probably eventually turn back to the light though, but not before wreaking havoc across the galaxy.
As for Mace's line, I think that may have been improvised. Samuel L. Jackson seems to only be able to play the bad mother****er. I know he requested that his character not "go out like a punk" in Revenge of the Sith (a recent TV Guide article spoiled who he meets his demise by). I can agree with him on that. I think his character deserves to go out blades-a-swingin'. Mace Windu looks like he can kick some major ass. Jango Fett went out like a punk: decapitated in one swoop. It's too bad Boba is too young to avenge his father's death. That would've been awesome.
