You’d think we’d have learned our lesson by now. Just because well-read blogs and overzealous Brooklyn tweeters proclaim bands the next big thing does not make it so. Having lots of friends four hours north might get a band a lot of buzz, but eventually they’re going to tour, and touring is when you find out just how capable a band really is. Cymbals Eat Guitars, headlining at the Rock and Roll Hotel Saturday, initially…