as you said it's not a full time job, and is meant to be fun. I would have never joined this band based on what you've said about the other players abilities after jamming with them once. I've had to end bands in past as well, knowing full well me walking away was the end of the band.. - was jammin with a drummer (basically was my son's best friends step dad) that thought practicing was listening to the song and air drumming it out in his truck on the way to rehearsal, and a bass player whom after 3 months couldn't be bothered to learn a basic 4 bar octave thumb slap progression. We played a couple small pup gigs as well, even that was a nightmare and a lesson in humility. - One of my previous covers bands, the bass player got into cocaine, and joined 2 or 3 other bands. we were rehearsing at his house, and he was also the booking manager. After 2 years things went down quickly. I'm playing with the same drummer in a new band currently. If it gets to the point you're not looking forward to the rehearsal, buddies / friends / pals..... it matters not, it's time to call it IMHO.