Aliens: Colonial Marines
At trade shows like E3 and PAX, developers build these things called "Vertical Slices." Essentially, they're calculated excerpts from their game that are polished with a deliebrate need to make the game look as good as possible. These builds exist in a vaccum, and fall apart if you don't follow the exact path. Sometimes, the final game reflects the vertical slice, and sometimes it doesn't. Aliens: Colonial Marines was the latter to such an extreme, people dug deep and investigated the money movement around it between Gearbox and Sega, and dug up as much dirt as possible. It was a big stinker, and one that was sold to everyone on a solid event demo.