Quite simply, there is no particular reason to see this film. If you are a fan of the actors involved, you won't be particularly impressed by what they do with what little they are given. If you are a fan of special effects, the best they come up with is, well, stuff that looks a lot like lava. If you go crazy over disaster movies, you might sleep though this one. If in-depth character studies revealing the ironies of the human condition are your thing, the screenwriters manage to go no further than exploring the predictable morality-play trivialities of any disaster movie since The Towering Inferno. If you can't tell what's going to happen to each character within minutes, you must have dozed off. Volcano doesn't even make a challenging game of "Spot the Cannon Fodder". If you are a fan of films featuring seismic activity your time is better spent with Dante's Peak. And certainly, if you enjoy good plots with plenty of suspense and unexpected twists, there's nothing for you here. Sure, it is unexpected for the residents of LA to wake up with a volcano erupting in Wilshire Boulevard, but that's no surprise to the film-viewing public, given the eponymous title (and I don't mean the movie is called "Wilshire Boulevard"!) And if, by some strange twist of fate, you've got a special thing for pyroclastic flows in all their glory, there's not even a mention of the possibility of that horrible fate in store for LA's denizens.
Now, if Mick Jackson and his band of merry men had worked in an ending in which massive mutant magma men lurch limberly from the lava and hurry horribly to Hollywood, where they totally terrorize Twentieth Century Fox into producing their putrid picture--a vile vision of an LA volcano that vomits forth massive mutant magma men who...
Believe me, it would be more interesting. Heck, this movie would be more interesting even if it just had a character who constantly chatted in alliteration....