Again, keep it civil guys. 343i promised nothing. Aside from the graphics we ended up with, with the "actual" in-game renderer...we got exactly what we were shown. I keep hearing about we didn't get what they promised. I fail to see any aspect of the game besides graphics, that didn't live up to one quotable or documented item. Anything else is just personal taste being trampled on by the developer.
Second, about weapons...yes every game had weapon issues. I keep hearing about this Incineration Cannon problem. Saying it can take out teams in total, and that it is OP. I didn't hear quite nearly the amount complaints about the target locator, that the IC is getting. The target locator was even worse since it could track vehicles. And the splash radius on it was well 4x the IC. But again, not everyone in the population sees or comes across the IC as a problem. it may just be abd luck or bad timing when playing a particular playlist.
Third, the online numbers don't mean anything unless it comes directly from 343i or Microsoft themselves. Secondary and third party number runners can pull and tweak data any way they see fit. And no one person can log-on at a particular time and see the overall big picture. You would literally have to login for a week straight and be on 24/7 to get a fully accurate average number count. Again, sites like halocharts don't equate to squat.
And yes, not having bungie developign the title is the major underlying cause for the hate towards Halo 4. Just like Reach, as a stand alone halo title it is quite good. But subconciously, people still can't shake the Bungie love out. I've seen a lot of games suffer this effect over my 30 years of gaming. It gets worse before it gets better though.
As for the decline of Halo...it is more than just a decline of Halo. Shooters themselves are not as popular as they once were. Shooters now or days are churned out in droves, and usually focus around a common metric. Not to mention that now that the economy has declined significantly, gamers make wiser and more carefull choices with their purchases. There are a myriad of factors that effect a games sales, not just the gameplay.