Good on ya, i walked on a band earlier this year, it was the end of an evolution of bands that started about 8 years ago and slowly changed members oevr times so was a pretty big decision to leave it. was pretty much the opposite reason, our singer was the unofficial leader and he had become a bit of an egg. he wanted to stop playing hardcore and start playing rock. i sorta held off for a month or so. Then had made my decision and was gonna quit, but the singer never actually came to practice for the few weeks leading up to my last show, so then last song of the show i told the bassist it was my last show. finished up and that was that. they got a new guitarist, have played 3 shows in the last 8 months and are now breaking up apart from they cant get the singer to confirm his ability to play shows since hes busy with his poetry band. never seen a guy go so full circle in such a short time, 2 years ago he was tough guy hardcore straight edge vegan, now hes none of those things.
im much happier not being in the band, now ive got my 80s metal band to concentrate on and have never been in a band that is so enjoyable.
so in summary- good stuff, hard decision to make but in the end im sure youll end up in a better situation, next band just make sure everyones pulling their weight from the start. good luck finding some good dudes