I know it's a bit of a treasonous sin punishable by death 'round these parts (.. I think), but I only continued purchasing the Halo games because of my love for Bungie itself. I knew they weren't really getting any better (aside from the multiplayer - Bungie has NEVER made anything less than perfect multiplayer), at least to an extent.
Being a Bungie fan is essentially in my blood at this point. My father was a mac fan-boy (despite his saying otherwise), and he still is. Which meant I was exposed to Bungie at an early age (in fact, Marathon was certainly my first shooter, Myth my first Real-time Strategy, and I might have even touched Oni a bit, although I don't remember it if I did).
You can certainly admire and support far worse companies.