Company Loyalty
There a few companies from which I will buy every game that they release on day one. The main four are Bethesda, Bioware, Blizzard and Valve. When thinking about why I picked these four companies, I realized each one had one defining characteristic. None of the four excel in every characteristic but they are all given carte blanche to my wallet.
Bethesda: Bethesda, in my mind, ex cells best at giving a vast, epic, open world. I may not have liked the story in Fallout 3, but the the world was immense and very detailed. Morrowind will always be one of my favorite RPG games for the incredible world in that game.
Bioware: Bioware are masters of storytelling. Stories are often one of the easiest things to screw up in video games, but Bioware can consistently hit the nail on the head with their games. Their characters are relatable and interactions are very immersive. The story in Dragon Age is fantastic and it really makes you care about the characters.
Blizzard: Blizzard is all about polish. They may not revolutionize the gaming industry with new ideas, but they will take the best ideas from everyone else and polish them to an incredible degree. The looking for group system coming in WoW's patch 3.3 is just another example of this. It is nothing new to games, but it looks incredible in its implementation.
Valve: Customer commitment and product support. Valve loves their customers. The amount of free content their put out for their games is remarkable. They could be making millions off map packs and new content for their games but instead they choose to just release it for free. I know that every time I purchase a new game from them, I can look forward to years of support for it.
Epic worlds, storytelling, polish, and customer commitment. None of these companies excel in all four of these aspects, but I believe each one is the pinnacle of its area of expertise. I look forward to all future games from these developers with a fanboy sense of zeal and a worried wallet.