As one of those people, I just can't explain it. While the story itself was decent, I didn't think it had nearly as much as the original. Also a few other things;

Venkman felt toned down as a whole. I know his relations with Dana were already established, but it would've been better if he was more of the suave bastard he was in the original.

Egon felt almost gone from this movie, compared to the original. Originally my favorite character, he felt absent unless it was in a scene involving Stantz and Venkman. And Stantz seemed to have most of his conversations with Winston.

Winston...I feel part of the reason he worked so well in the original is he arrived so late in the movie. Naturally, they couldn't do that in this movie, so his role was expanded a lot, and a lot of his one liners fell flat. And I mean, who the hell hates Jell-O?

Louis Tully getting with Janine, who was Egon's woman in the original. It was better that way. Tully was funny and everything, but he almost played out like a parody of himself.

Vigo seemed like a huge step down from Gozer IMO, I always found Vigo to be kind of a joke.

The same goes for that judge, in a lot of ways he was the poor man's Walter Peck.

Someone already mentioned the Statue of Liberty thing. No idea why I would get wrapped up in something like this when the movie is about ghosts that can slime you. I can suspend realism over something silly such as ghosts, but the Statue of Liberty thing made me scratch my head when I was 7.

I hated baby Oscar.

Overall, this movie was a lot more toned down than the original. It wasn't awful, and it did have some good things. I always feel origin stories work so much better than later stories, so while this is alright, I can't watch it in the same way as I could the original.