How to make fans happy: no retailer exclusive pre-order crap (the Reach stuff was pushing it) and no day one DLC.
How hard is that really?
Halo 3: No preorder only DLC, two DLC pieces, two DLC pieces held back to promote other releases
Halo Wars: Two DLC pieces, both have been full price since 2009. 10$ for 3 gametypes. There are no more than 16 people playing the playlists for these gametypes at any time.
Halo ODST: preorder only DLC (Johnson)
Reach: Preorder-only AND retailer specific DLC (Gamestop armor), preorder only DLC (Recon helmet w/ attachment), two DLC pieces that have stayed full price since their release a year and more than a year ago, DLC attached to promoting another release, and a gametype that requires you to buy 15$ DLC to even play in matchmaking.
Anniversary: Preorder only single player content that is on the disc
Prepare for Gears of War 3-level retailer bonuses and exclusives for future titles.