One of those movies I felt got that difficult balance between comedy and horror just right.
The spider sequences (apart from the silly big spider at the end) were very effective, and like Jaws worked best when they were largely unseen, just the odd glimpse and the effect of their bite on the victim.
On the comedy front, Goodman's exterminator was hilarious, but bless him...Julian SanRAB is a dreadful ham actor.