i think that just because a bass players lines are simple doesnt mean they are a crappy bassist. i think that in a 'typical' rock band setting, basswork is more about fitting in the pocket than playing something crazy and technical to stand out. i play thrash and death metal, so im used to writing fast, somewhat complex riffs. but i also play for my church, where im given a lyrics sheet with chords printed above the words, and i mainly play root notes, but occasionaly (depending on the feel of the song) maybe some arpeggios, 2-note chords, octave jumps, sweeps, blues-style basslines, some slap, etc. but based solely on watching me play a simple song that calls for just root notes, one could say i appear to be a crappy bassist. however, people who have watched me playing complex death metal riffs will argue that i am a fairly good bass player. playing skill (in my opinion) cannot be judged by watching a bass player play single quarter/eigth notes in a song that calls for it. if they can play in time with the song and can maintain a solid low end, then they do the job just fine. i think that crappy bass playing is when a bassist cant play in time with a simple song. it also depends on the genre of music. while les claypool is a fantastic bassist, as is sean beasely (dying fetus), having the 2 sawitch bands would have disasterous effects