People often have a tendancy to incorrectly identify the more minor aspects they actually like about things compared to what they feel that it is they like about them. Combine that with aging and a shifting, growing market and you really do end up with quite a bit of difficulty finding which of the core threads to pull on.

And 343's Halo really is quite different from Bungie's Halo. And that is on all 3 points (Trilogy, ODST, Reach) where they bring in parts from what Bungie did and new things, and some aspects are called out as problems when really a lot of it os a divided Fan Base, depending on which prior games they preferred.