Film buffs LOVE things that are totally great. A lot of cult movies are not totally great. It's not an outright panning of cult movies, it's acknowledging that there are better movies which really are totally great. To me, at least, cult movies like Boondock Saints only leave their effect on the first viewing, so it's not as good the next time you watch it. Good movies you want to watch again. It's entirely subjective, I know, but most of the people you can call film buffs recognize this.
It's kind of like Daft Punk. Daft Punk is alright the first few times, but starts to get boring after more than a few listens. Some people will go looking for better music, most will blast it at every party they host for the rest of their lives.