Those are the most typical that I've spotted - really flat, boring stories, pacing problems, and just stuff that's confusing as all get out. ;) Once you've figured those out, the rest, I think, is fairly easy!

I agree, too, that a good critique can open your eyes to bad habits. I also think that giving them is helpful for the same reason. After reading a few dozen really bad stories, you start to go, "Why did it suck? What made it suck? Do I do the same thing?" And if you're a beginning writer, yes, you probably do. So in figuring out how to make someone else better, you also teach yourself how to write better in the process.

(Honestly, it was in figuring out why some stories I've read are flatter than others that I finally figured out what it takes to give my own stuff a bit more "omph". Not that I'm perfect, but...it definitely made me better!)