If this movie wasn't supposed to be a Hellraiser film (spoilers)
I'd probably like it a lot more. If you look at it as a revenge film with the hallucinations taking the place of the Cenobites it wouldn't be half bad. Turn the Cenobites into ghosts that inhabited that house when it was a mental institution or whatever.
The movie itself is a lot better than some crap I've seen (insert any Asylum picture here) Lance Henriksen's son could come back as a vengeful ghost and off him at the end, and then you still get the ending with Lance in the back seat.
The thing that really makes it suck is that it has zero to do with Cenobites, they're crammed in there as an afterthought, almost. Apart from the giant Lament Configuration in the foyer there's not much there. Though to be fair I guess you could say this about any of the sequels after Hell on Earth.
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"It's better not to know so much about what things mean." David Lynch