I haven't seen The Devil Inside, but I nominate Haywire on the basis of the main chick's acting ruins the entire movie and makes it near unwatchable. Otherwise on just shitty movies I nominate Contraband, Casa De Mi Padre, Wrath of the Titans and Ghost Rider: Spirit of Vengeance (it was leaps and bounds above the first one though).
9/11-13 Riot Fest
9/19 Uncle Acid & the Deadbeats
9/25 Cattle Decapitation
9/26 D.R.I. and/or Alcest