The first two Rec films i really enjoyed, the third and forth were watchable enough but didn't really follow through with the found footage element and lost a lot of the original impact.
I saw them a while back now but i'm sure the third one started off found footage then abandoned the idea halfway through the film.
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MIKE: I've got it! Peter Cushing! We've got to drive a stake through his heart!
VYVYAN: Great! I'll get the car!
NEIL: I'll get a cushion.