Seriously, grow the fuck up man. Lots of people do boring monotonous jobs they don't like where they have to deal with arseholes all day long, and they just get on with and save the bitching for afterwards. You've got paid work, in a difficult industry, doing something you love - and you're bitching because a few of the people you have to work with are idiots? Deal with it - it's still better than serving fried chicken or taking phone calls from angry morons for 10 hours a day.
This is exactly the kind of job you should do to the letter how they want (obviously within reason). At the end of it, you'll feel like you've put in the effort, you'll have a job you can be proud of finishing (even if you don't like the end result), and you won't be biting the hand that feeds AND kicking yourself in the balls by fucking with your own client base. Plus at the end of it, the band will still suck.
If it's really so bad that you can't work with them, tell them it's not working out, give them the recordings and recommend them some other studios/engineers that can finish the mix for them. Be the bigger fucking man.
Steve