Bang for the buck. That's pretty much it. I don't really care what brand I shoot with as long as it offers a lot of bang for the buck. I'd be shooting Nikon, Canon, or Sony if they offered more bang for the buck. Pentax seems to be the only DSLR camera maker that offers a lot of bang for the buck.
But I'm like that with that for everything else, though. Everything that I buy has to have a good bang for the buck value. Cars, food, clothing, electronics, & everything else. I don't care what people think of a certain brand. I don't care if a certain brand is overrated or underrated. I don't give a damn what brand it is as long as it has some good bang for the buck value.