Decisions can be a big relief sometimes...

Went through the same thing years ago. This guys was fun to party with but well the singing. It is easy to get lost in the moment of partying with your crowd and not hear theese things at first. What really sucks is when you do a recording and they act like everything is ok. I ended up leaving that band and a drummer that I brought to the band that was going to be hard to replace in our area. No need to cut your self short on your playing I started another band from scratch with a lot less talent. Practicing together 2 nights a week for 4-5 hours a night. Got things pretty tight and then found a guy that knew how to sing and been with him since 2000. Good luck!