I think nonmemorability is a form of badness in and of itself, really, in that it seems to me one of the purposes of a level name is to increase recognizability, making it easy to talk about hosting Dis or SBv2, rather than having to resort to things like filename (battle1, bblair) or picking between a host of levels with names like Toxic Waste, Toxic Woods, Toxic Wasted, Tropic Waste, whatever. So ++memorability.