I don't think it's just joinmyband, we've been after a new guitarist for a punk covers/originals band, about 50 gigs a year, (all stated in the ad) on joinmyband , facebook ,Gumtree etc, so far we've had 4 replies, one guy got in touch 4 times to exactley the same ad in different places and then said he didn't want covers, despite the fact that's what it said in the ad, another failed to turn up to the audition twice before admitting he was too busy at work, another failed to turn up for audition, then admitted he couldn't really play well enough, hopefully the last one will work out.
One of the problems we've found is decent players are already in too many bands to commit to 50 odd gigs a year