“Serena Waits” (*1/2 out of four) was a wretched revenge horror thriller about three college louts (Colton Wheeler, Charles Chudabala, and David Marlowe) who find themselves haunted and hunted by a girl (Brialynn Massie) who they raped and attacked and thought they left for dead. Exploitative and unpleasant story is yet one more rip-off of “I Spit On Your Grave”; by this point, maybe it’s best if we let that movie rest in peace and moved on. You can feel the padding on this one, even at only an hour-and-20 minutes