To be honest, I can't say I don't like any company other than the mobile market.
Nintendo makes awesome first party games. I still love Mario, Donkey Kong, Kirby, Super Smash Bros... And I had a lot of fun with many Wii games.
Since I'm a PC gamer, most of my support goes to Microsoft. Also, they have Alan Wake, do I need to say something else?
And Sony still have a lot of great exclusives, even if I don't play them, I recognize they are high quality software.
So... Well, I think mobile gaming is fun when you have to kill some time? I used to play Block Breaker 3 Unlimited when I had to wait my ride back to home from the college...