Fuckin' Ryknow. This man is a beast.

Most of my favorites were said, but I think the guy from the Who was massivelt underrated. When you back and actually listen for the bass parts they're nothing short of awesome.

Steve Digiorgio outplays everyone really.
His delivery on Autopsy's releases is unmatchable.

Al Cisneros from Sleep / Om / Shrinebuilder

Cliff Burton's already been said, so Frankie Bello.

Skrillex

Tord/Todd Overland-Knudsen
Met him and the rest of the band, their all hilarious.

*they're

and i really like fat mike

tim commerford from rage against the machine

Geddy Lee. You could hear the guys awesome playin over the guitar and the guy can sing beautifully well doing it

Joey DeMaio from Manowar.
Say whatever you want about the music or the band, but this man knows his instrument.

www.youtube.com/watch?v=XSYrTKXLYH0&feature=related

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(Sorry, couldn't help myself.....you knew someone was gonna say it.)

Anyway.....I joke, but you can't go wrong with a lot of the old greats: Cliff, John Paul Jones, Geddy Lee, John Entwistle, Flea, and so on. One that I do think is underrated as hell is Queen's John Deacon; though Freddie and Brian tend to get a lot more of the spotlight, Deacon's given us some of the most memorable bass lines I can think of ("Breakthru" and "We Are The Champions" stand out).