I agree that this was the laziest choice possible, and seeing Klaang at the beginning 'Broken Bow' was the first of several such lazy disappointments I felt at the pilot.
I think it would have been much better had it been a very angry Andorian. They're warriors, and by no means overexposed, plus they're still fairly antagonistic in the 2260s. Others have suggested having the Vulcans and Andorians be in some kind of Cold (or Hot) War as the series opens, and having Klaang be an Andorian would have fit nicely with this.