I dunno about "biased" -- if this is your favorite, if this is the high point, then you didn't like the other Bioshock entries as much. It could be said you were either open to liking Infinite, or even biased against it before playing.
I've just freed up my last obsessive game, and am ready to start up another -- and I'm having a hard time thinking about going back to Columbia. It really is pretty, fo' sho' -- but where I felt that Rapture represented its themes quite well, the feeling of unrelenting pressure, the cracks and damage, the darkness... I am left wondering what Columbia is supposed to represent with its open skies, majestic beauty, and segmented, traveling town sections. Does it mean anything, or is it just pretty?