You know Yahtzee, you can complain and complain about how Halo hasn't changed much in 9 year's, but people will pay for what they want.
If they want a Iffy story set on a doomed planet with one of the greatest endings known to thinking man, with a fan base consisting primarily of 20-something-stay-with-they're-parents till-they-eventually-die men, or shouty 12 year old's (Halo: Reach), they can.
If they want a story so long and thick they could replace it with Cloud's buster sword and he wouldn't know the difference, it's characters mainly consisting of emo teenagers who constantly grind xp and item's so they can get their +5 pen knife of self cutting (Final Fantasy VII), they can.
If they wan't a Shit story, a dull as can be score mode that makes you collect stars (the second most over-used score system since F£%$&!G points) and a multiplayer so full of the same "macho", and I use that term as loosely as the law allows, men, the same 12 year old children (only more fowl mouthed) and hackers that never get detected (Modern Warfare 2), then they can. But if they do I would hit them for filling Bobby "I don't know when to shut my mouth and stop ripping off my own costumers and company's" Kotick's pockets.
There, I have made my point. Now I just need to remember what it was in the first place.