[warmcat]

"staffed with below-average IQ people"

I don't think anyone is in the position to judge other IQ's especially co-workers. These people passed the same interview loop as you. Just puts them in the same "IQ" bracket as you. Maybe they also feel the same way as you and don't want to put their effort in trying to turn this team around and just want to coast and switch later on. You need to get off your high horse and try to understand the motivations of the team by talking to them individually and bringing stuff up in standups/meetings and suggest ways to improve. Work with your manager. Maybe you can be the one who can turn this team around without burning out yourself. In the end, its just a job and trick is to not take everything personally.