Do not think I try to encourage you to use that site, I don't really have any reason to think it'd do better than other ones; this just for conversation's/my curiosity's sake.
Theoretically, if you are careful, you can stay away from the dark places, as not everything in it is dreadful. Certainly, if you kept yourself to Lego/KotOS stuff only, you'd be safe! :P
I find it funny, though, that there actually are Lego stories on fanfiction.net. I mean it might not have been as weird if not for the existence of the LMBs, but since they do exist, why not write in the LMBs. Unless your stories are really too much for there...
As for LMBE, I intend to test whether they will indeed be as strict concerning romance stuff aka kissing, as I can say that here! :P Because even though they may intend to be as strict in theory, I'm not sure if they will remain true to that to things that might not seem of importance to them. And I don't know how they will think about it, but I'll see. Besides, even the professional mods have been known to have different approaches over the same matters, let alone the... amateurs? Somehow that word doesn't sound right being used for moderators.