Unrelated to the original (and gorier) Spiders, Spiders 2 lacks the things that made the original such good fun. It moves along at a pedestrian pace, with the plot being revealed slowly in layers as if you're peeling a very big onion. Unfortunately this means that it takes what seems like a lifetime to reach the blood and carnage, which when it does finally arrive will leave you rolling on the floor laughing. It's not horrific and I'd imagine the only people that could possibly find it scary would be diehard arachnaphobes. That's not to say it isn't fun. The story may well move along slowly and take a while to hit the action gas pedal, but you know all the way that there's something dodgy going on (you'd hardly need to be a brain surgeon to work that one out though) and at least they're attempting something more than outright blood'n'guts and trying to tell a story, albeit a totally ridiculous one.
The Spider effects are mainly CGI, but don't expect anything as good as the rather lame attempts they made in the first film, the digital effects are actually worse in the sequel than they were last time. Long shots of giant spiders crawling around on a massive cargo freighter look hysterical, and are recycled time and time again throughout the film, giving it that ultra sweet drive-in feel that so few films manage to capture these days.
Most of the cast are OK, but the standout is Richard Moll as the evil scientist with a rather nifty sub-Vincent Price turn - he's so good at being bad he makes you want to hiss every time he wanders onscreen.
All in all it's a reasonable film. It's not as much fun as the original, but that's only due to a pace that allows the filmmakers to build a story rather than go for all out action from the off. At least it doesn't try to recycle the story and characters from the previous eight legged outing.