Comparing Mixtapes and Transit seems a little weird if you ask me. Mixtapes's very nature of a band doesn't actually create any expectations. Their songs are almost supposed to be somewhat average -- but that helps contribute to the "hey these guys are just like you and me" that makes the band awesome. The new song doesn't help push any new musical boundaries, but Mixtapes aren't boundary pushers to begin with.
Meanwhile, Transit did create some expectations with L&F and then were victimized by their own success on Young New England. I know they can do better, so I expect better.
You lost me when you said the point is that they're not good. Lol.