I think this has been reported in various forms.
Monsters don't wander (as far as I can tell). This makes it so that the only place you'll see monsters is regen rooms. As a result, the way to Markus is mostly empty and way easier than it should be. Vortex is empty, and way easier than it should be.
If you run from a monster and it doesn't follow immediately, it's not going to follow. In majormud, if a monster doesn't follow you immediately, it still might come into your room eventually.