One bloke I think is good is Brian Gibson, the bass player from Lightning Bolt. Not for any real technical reasons, but just because he's done things I'd not heard of before and has come up with some really good riffs. It's the latter point which I like the most. You do get people going on about the complexities of his riffs, but IMHO they're not complex - fiddly perhaps at times, but more often that not they're just good chunky sounds.
For those techies amongst you, he does have a bit of an odd bass setup. According to Wikipedia (and I've read this elsewhere) [i]'Gibson plays his bass guitar tuned to cello standard tuning, in intervals of fifths (C G D A), using a banjo string for the high A. He used this four-string setup for several years, but has recently been seen using a five-string setup, tuned to C G D A E, with banjo strings for the A and E. Gibson also uses several effects pedals, including overdrive pedals, an octaver, a delay pedal, and a whammy pedal (pitch shifter).'[/i]
As for anyone being overrated, such stuff doesn't interest me. I got past trying to make such analyses when I was into heavy metal and got into millions of circular arguments about who played the best solos...