I wasn't expecting much from WT3, having read some terrible reviews. However, I must admit, I found myself really enjoying this film. What we have here is a basic survival horror, in the "guess who will survive" theme. The originality in the story is the "victims" - a motley crew of convicts, escaped from a crashed prison bus. This leads to a "bad guys vs. badder guys" aspect which is, undeniably, a lot of fun.
The writers managed to include a smidgen of continuity with the previous 2 films. Three-Fingers' cabin is here, and the charred remains of the watchtower from part 1 is there too. Infuriatingly however, there is no mention whatsoever of the previous killings and disappearances, while yet again the previous survivors are a no-show.
Gone are the huge inbred family of mutants. We have just one: Three-Finger, who miraculously survived the previous 2 films - and his adopted child mutant - presumably the deformed baby from part 2. (Again, some subtle continuity).
The female sherrif's assistant, built up as a possible hero, seems to disappear from the story for no apparent reason, leaving the heroics to a prison guard and a fugitive. The outrageously silly "twist ending" will leave you reeling and possibly laughing, long after you switch off your DVD player.
Still, WT3 is definitely a worthy inclusion to the series. In some ways I enjoyed it more than part 2. Even the bad bits were good: The rubbish 80's style special effects, and the dreadful American accents from some obviously English actors.
Buy it, watch it, don't expect much, and don't take it seriously.