For me, it is boring. But I wouldn't go so far as to say I hate it. The games all look nice, more or less (and for their time, I don't think Halo 1 will age well), but looks don't make a game. Halo 2 and 3 are the exact same game stylistically and in their mechanics, the only thing different are the levels. Not necessarily a bad thing if you like the games, but it is a weakness for me because I didn't much care for it.
And the story line, my goodness! When people praise it I can't help but shake my head. I'm sorry, but it is as generic as it comes, there is nothing special about it, it has been done a million and one times. Aliens, big scary weapons, super space marine, humans win. It is just a tacky, typical, sci-fi plot line. Honestly, if you can eat this up you need to read more books, and read older literature, so you can see where all this stuff came from. Trust me, I am an English Literature student with Trent University, I've done so much reading and studying in these past few years that I know a rehash of an old story when I see one.
But, besides the plot being a horrible rehash, there is really no reason to HATE Halo. It's not my cup of tea but that doesn't mean that the game itself is terrible...
But then you get the fanbase... Holy shit...
Don't get me wrong, some of you are cool, but when I hear younger people talking about Halo 1 like it's so old and so classic I just... I can't help it, I get a little pissed off... I mean, I don't consider the N64 classic yet, it's not old enough! Sheesh... Plus, playing online and listening to all that preteen crying and complaining is just grating... I know you can mute, but you're just going to keep running into more and have to keep muting over and over again... You can never silence them all!
Basically, if you love Halo, that's fine, if it's all you play that's cool (you're really depriving yourself of some really good stuff, but it's your call), but don't treat it like the cat's pajamas... It didn't really define anything, it didn't create anything, it's really not that special unless you have some sort of personal connection to it... It's just another FPS.
I suppose, in short, no I don't hate Halo, but I don't think everyone should be eating it's shit and calling it gold.