I said no such thing after Halo 2. It was the middle of the story, it ended on a cliffhanger, and everyone had to see how it turned out. The main story arc is finished now. I don't think it's unreasonable (or an insult) to say that only die-hard fans will really care about what happened in New Mombasa between 2 and 3. The rumored Halo 4, which would star Master Chief and take the series in a whole new direction with a new plot, is an entirely different story.
It also had pretty much unrivalled multiplayer for its time.
Halo and Halo 2 had no FPS games that could come close to matching their popularity. Halo 3, while a great game, now has to compete with the massively-popular Call of Duty games, as well as (to some degree) Gears of War.
Through all that, I'm STILL not saying that the game won't be highly successful. It'll still sell at least three million copies over its' lifetime. But expecting it to beat the original Halo 3's sales records in any fashion is just ridiculous.
Could I trouble you for some maple syrup to go with the plate of roffles you just served up?
Tag, courtesy of fkusumot: "Why do most of the PS3 fanboys have avatars that looks totally pissed?"
"Ok, girl's trapped in the elevator, and the power's off. I swear, if a zombie comes around the next corner..."