So, I came up with a way that I could objectively (well, objectively as possible) evaluate my standing of publishers/developers. I won't bore you with the method, but basically here's the ranking - higher the number, higher the level of investment. Note that no score can be higher than 1, and that this is an aggregate of their overall runs rather than how I'm feeling at this given moment:
Nintendo: 10
Blizzard: 8
Electronic Arts: 6
Bungie: 5
BioWare: 4
Valve: 4
Insomniac: 3
Rare: 3
Sega: 3
Square Enix: 3
Bethesda: 2
Capcom: 2
Epic Games: 2
Gearbox: 2
Id Software: 2
Konami: 2
Naughty Dog: 2
Petroglyph: 2
THQ: 2
Ubisoft: 2
Volition: 2
Going through this, there isn't too much I feel needs explaining except EA's entry. It kinda kills me inside to rank them so high, but the thing is, much as I dislike EA, they do have a number of IPs under their belt that I am/have been interested in. Apart from BioWare, none of these IPs can really be listed under a separate developer unless it wants an entry of "1." (e.g. I like Command & Conquer, but I can't call myself a Westwood fan because it's their only IP I ever got into). Similarly, I can give an entry for THQ while still keeping Volition separate.
Obviously this isn't an exact science, but it's about as objective and accurate as I can be while keeping personal fanboyism in check as best I can.