Yeah but you get a nice ramp-up period where you're allowed to be bewildered and unproductive. In that time, you can probably pick out two or three grandiose changes (ideally with hot new technologies) to throw on the pile before that period ends, and use them as resume padding and interview stories for the next job.

Unlike the old developers, you aren't complicit in the mess until a few years go by.

There are plenty of greenfield projects out there.