Local productions of classic Broadway shows generally aren’t expected to measure up to the New York originals, even in sophisticated theater towns, but a new version of “Annie Get Your Gun” currently playing in Denver is drawing some uniquely ugly reviews, and more than a few snickers from the audience. “When Annie’s gun sticks but a dead bird falls from the sky anyway, what are we to do but cringe? And when the band resorts to banging on drums to cover misfiring guns, what are we to feel but mawkish empathy?” And the problems don’t end with misfiring rifles.