It feels like you're talking about two different things here.
1. Design choices.
2. How those design choices were communicated.
If you* think the design choices are crappy and that they cumulatively make for a crappy game, then yeah, that's a great reason for not buying the game. But if you are just frustrated by what and when and how 343/Microsoft is releasing information, then... I dunno, write an angry post on a Halo forum or something! This hasn't always been the case obviously, but at this point 343 has either directly communicated or implied their design philosophy pretty clearly. We have a pretty damn good idea of what to expect from it. And anyone who participates on any Halo forum has also had a chance to read plenty first hand impressions from fans who've played the game, nearly all of which have been glowing. And those impressions had to come from fans. A fan says "feels like Halo!" and everyone gets hyped. 343 says the same thing and gets mocked for months.
*That's a metaphorical you, not you Bobs, hah.
Just to clarify -
For me personally - I am annoyed by both aspects - I felt like 343 was going a bad job of putting information out on the game and I feel like the information they where releasing is underselling the game.
I still feel like both aspects are going to hurt almost anyone who is on the fence about the game and is deciding between Halo 4, Assassins Creed 3 and Black Ops 2.
If the 'information' which is coming out is lacking meat or is just wrong - then thats hardly going to excite me.
If the 'information' makes the game sound like a blatant CoD rip-off - thats not going to excite me.
Am I right in thinking thats what you meant? Design choices + how those design choices are communicated is one and the same - if you make good design choices - but then communicate them badly. You mightaswell have made the bad design choices from the beginning as far as marketing is concerned.
For me - I played the game - I know the design choices are amazing. I know they are being communicated badly.
Most people can only assume that the communication is correct and the design choices are bad. Does that make sense?
Saw your edit - as a fan on a forum - I felt like the game was going down the 'lets rip off CoD route' which very nearly turned me off on the game - god knows I bitched enough about it before actually getting hands on time with it. I honestly dont know if I would have been day 1 considering how 'bad' the game sounds until you play it.