Well anyone can believe whatever they want, surprise surprise. I understand that it's all OTT, the fans, but so is the bloody series for crying out loud.
I know it may sound extremely lame and very gay but those 27 weeks were amazing fun and i made some fantastic friends because of it, there just MIGHT be reasons as to why they say it's so brilliant other than because of the show itself. I know countless groups of people that all got together at people's houses just to sit and watch episode 27 all together, i'm sorry but i've never heard another anime do things like that, so it's not THAT surprisingly people say shit like that. Fair enough it's your opinion and you don't think it's that great, fine, but they do, which is also fine.
Loads of people know it's not unbelievably original, hence why so many say it's a great parody.