overrated pedals:
zvex fuzz factory - it has a lot of sounds but none that i have really found useable. it has a treble bite that gets annoying. (take note i used this with a tele with single coils)
underrated pedals:
old DOD pedals -- FX10 is an awesome clean booster, Phasor 201 and 490 are very nice, warm sounding phasors, Buzz Box and Punkifier are thick fuzz pedals.
Ibanez 10 series pedals -- basically 9 series pedals in a different casing. the TS10 is a nice "more transparent" overdrive, the FC10 is a great RAT clone. etc