While in multi-player GLaDOS only seems to compliment Orange (P-Body) for winning and says that Blue (Atlas) is "Dead weight". I'm pretty sure this is standard because she says it when Orange is just holding a button down, but is it in anyway a reflection of your progress?
Does GLaDOS hate Atlas, the blue robot
portal-2
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Best Answer
GlaDOS seems more interested in dividing Blue and Orange than picking favorites, and will show favor to either Blue or Orange. In the Yogscast, GlaDOS awards Orange "five science collaboration points" in one level (10:27 in), then awards the same to Blue in a later level (11:45 in):
In a later episode, GLaDOS states that:
But the smoking gun, as it were, that she doesn't necessarily favor Orange comes at 9:00 when she states:
So whether it's dependent on performance is possible (although unlikely if you watch these videos), but she doesn't seem to have a complete disdain for Blue.