
I know what you mean, alhough 1 can be taken care of with a good editor to look over your work; you don't make that many mistakes or I would know; and 4 can be taken care of by just not giving scores to games and letting reviews speak for themselves.
Having said that, I'm not really that biased against Microsoft (now; age 11 was way different) and I like structure, so I think I could do a job like game journalism. I do hear what you're saying about "what if I wind up not liking games," though.
And I could never review JRPGs cause I'm so biased against them.