Killer Elite is the one that always sticks with me as being totally mis-sold by its marketing.
The trailer made it look like a high-octane, balls-to-the-wall action flick starring Jason Statham and Robert De Niro with a hair metal soundtrack, and who doesn't wanna see that?
In reality De Niro was barely in it, the film was like two hours long and 90% of it was just people talking.