He didn't make Hammer rip-offs and he didn't make counterfeit Amicus flicks, either. Norman J. Warren created a horror sub-genre instead, and "Terror" is the second best of these while "Prey" is the best. Though this was clearly inspired by "Suspiria" and equally ropey in terms of structure, is is still an entertaining hour and a half.
The opening film-within-a-film, a witch burning sequence, has better production values than the rest of this shocker, but it is, nevertheless, a graphic slasher (for its time) that takes some risks. Most of the murders are knife murders and we get lots of knife POV's and a procession of red herrings. A car lifted off the ground and up into a forest canopy shows some creativity and a poor sod impaled on spikes notches another one up for bloody horror.
Despite good transfers, the Warren films still look ugly because they were not lit too well. Some of the interiors are overexposed and the hard lighting looks more accidental than planned. The performances range from adequate to somnambulistic (perhaps intentionally) and the electronic score (by Ivor Slaney) is more noisy than musical.
Worth seeing, sure, but not anything groundbreaking.