It would be more terrifying if the creatures and bugs looked realistic.
Don't watch Doctor Who.
But you're talking about a movie that is almost 20yrs old. For its day, it worked just fine.
May I remind you how good CGI was in movies such as Pirates of the Carribbean? Lord of the Rings? King Kong? All 2 decades old.
True.
AAA movies vs this. I agree the creatures were lacking but some of the environment effects were pretty decent.