Razor, Seph and TychoCelchuuu have all brought up some good, well-reasoned points that support mirror matches. And again, your entire argument has boiled down to "it's boring, I don't like it."
Pro mirror match boils down to: it's better for competivity- particularly tournaments; could be interesting.
Con mirror match boils down to: could be boring.
It being boring or not is what it always boils down to in this, since you really can't argue against the competivity other than that a player needs to know more than one faction - which isn't a 100% so since you can win a BO3 2-1 with the preferred faction, and a BO5 3-2.
And what's the best way of finding out whether it's boring or not? You can either look at some existing games, or you play the damn alpha. Since the second option takes a lot less extrapolating and assuming, why don't we pend judgement for a bit?
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