Being in a band that develops a great sound usually takes time and commitment. I started playing with a friend of mine who’d never played live before. He is, by all accounts, a bit mad. In the beginning it sounded terrible, but now he’s pretty good. It’s taken over a year to get there. I play jazz with a group of beginners, too. Musically they’re pretty terrible but they love it (and turn up every week on time - that means a lot).
I used to want to be cool in bands, now I just want to enjoy time with great people. If you like these guys and want to work to make it better, then good for you.
If you’re looking for the perfect band, then it’s probably better to start one than try to find one.
If you decide to quit, do it amicably. When you start pointing out the faults of other people they’ll usually find a few of your own, so tread carefully is my advice.