For me... it's just boring.... I run, I shoot.... uh..... that's it.... not really much of a story to it either. Just feels mediocre. I like the multi but not by much since the game play it self feels so empty.....

^i thought it had a good story

i dont hate the game, its just not my cup of tea.

i have played Halo 1 and i couldnt get into it, but my brother loves the game but he will only play it online with voice chat on so it can tease all the *in his words* "Yanks"

I enjoyed halo 1, halo 2 has ok single player never played it online, i have yet to play halo 3.

overall i think halo series is decent series and i can see why people would like it

The main reason is because Halo has a large and very vocal fanbase. Those who bought an Xbox basically had only Halo as a decent game for a long, long time and so it became the face of the system, and what all Xbox adopters rallied around. I think the amount of pure "OMG Halo is so awesome!!!!!!!!111!!" just gets on other gamers' nerves, and so they tend to hate Halo.

^ true

its' funny cuz I love the 360, but not Halo...It is not a bad game, just don't really like FPS.

Im not sure that everyone hates it per say. I think it's partially b/c everyone that does like it doesn't feel the need to run out and tell the world while ppl hate it do. The negative will always ring louder than the positive. A lot of ppl still really like Halo, I dont like the multiplayer in H3 as much as H2 but the story was much better IMO. Though Halo 1 was the best in terms of story, but thats my opinion. 

 Everytime im on Halo an average of 250k to 450k players are on and thats not weekends. I believe COD has the most unique users per week (as in Major Nelson's updates) but I found an article not to long ago that said Halo3 had highest average of users on at any given time. I can't find the article atm but when I switch games, the numbers I see certainly show that.

This is my reason as well.  IMO, the game is solid but not bad or good.  I bought my 360 a couple months before for Blue Dragon and Eternal Sonata.  The future release of LO also convinced me to get one.  The Halo 3 fiasco was a painful time for me to be a 360 owner.  Practically everyone I knew that had a 360 was just really really into Halo and they all expected me to think it's God's gift to gaming.  When I told them I'm not that into it, they looked at me wierd (why would I ever think of getting a 360).  I was about to sell the system then, but I'm very glad now I'm not with all the jRPGs coming out.

Luckily, COD4 rectified the situation and was a quality game that deserved it's sales.  The HL games will be the best shooter franchise forever.

 Never played Perdect Dark always wanted too but doubt that its better. Half-Life sucks too. IMO