This site is primarily for late teens, early twenties in general. That's the medium age. So, yeah, you see a lot of newer posters who's joined between 2012-2014 who seem to be passionate about about Garfield, Webb and TASM franchise. It's not that far to surmise that they are in that age group. And most of the older posters here who were probably in the same age group in 2002, that's what they grew up. But before the whole "nostalgia" bias argument is brought up, at least the 1st 2 SM movies were well received both critically and financially.
I think it's sort like the whole kool-aid thing, that Garfield is more of this "hip" or "this generation's Spider-Man" that that age group finds appealing? Plus, he's a good looking cat and I think a lot of people are enamored with the "love story" and find him relatable or identifiable.
Meanwhile, the movies he are in especially the 2nd movie is pretty maligned by the geek community, something you don't really have with any of the top tier movies.