Actually, it's not quite ... uhm ... fair ... to pick on
The Core.It's kind of like wondering why that stuff you just stepped in smells bad, knowing that the stuff you just stepped in smells bad.
The Core already has the dubious distinction as being acknowledged as one of the worst films ever made when it comes to science. In fact, it's not rocket science! The rocket scientists at NASA judged it as the No. 2 worst science-in-a-film film, only topped by the fantasy neutrinos in 2012. It constantly ranks high (or should that be "low") in many bad films list - a random sampling I made had it in slots 1, 2 (NASA), and 3.
For some reason Rotten Tomatoes gives it a little bit of value:
A B-movie with its tongue planted firmly in cheek, The Core is so unintentionally (intentionally?) bad that it's a hoot