Swamp Thing isn't completely successful at banishing the old corkers and stereotypes, but it's a harmless, watchable comic-book thriller, refreshingly suitable for kids of almost any age.[10 May 1982, p.C2]
Swamp Thing has many dubious qualities, but it clearly isn’t a piece of product tested and polished to a blinding gleam, and the world is duller for not letting oddball efforts like this slip into theaters once in a while.
Deserves - to be "watched" with steam on the windshield and passion in the air. When the monster in a monster flick packs all the fearsome wallop of an overripe avocado, one needs some diversion.[8 June 1982]
Although SWAMP THING was definitely aimed at a different audience than THE HILLS HAVE EYES, Craven fails to capture the gothic quality of its comic book inspiration--which had some genuinely frightening and grotesque moments. Instead, the whole thing is merely silly and not much fun.
It's not bad. It is very much the B-movie that Wes Craven was known for prior to his hit with A Nightmare on Elmstreet. Decent acting, fun special effects and pretty good story, it is a fun movie that doesn't try to take itself too seriously, it just tells it's story and leaves it at that. Is it the best Superhero film around? No, not even close. But is it worth watching? I think so, ****