I didn't see this as a problem. Mike's sarcasm and glibness allowed him to remain relatively consistent despite the various dialogue options.
Unlike past RPGs, where you're often free to bounce through an array of wildly different responses like a Magic Eightball of multiple personality disorder, all three of the dialogue stances seemed like plausible facets of the same personality. Mike might be a smug bastard, but within that personality is the potential for a wide emotive range - you can picture a smug bastard going hardass or softening up, depending on the situation.
The alternative would be a relatively bland and occasionally bipolar blank slate (i.e. Commander Shepard).
I agree with you To. The. Letter.
Good review, really.
I agree as well, I just hate the bastard anyway.