Giant weasels! I like the idea of bleed effects and damage over time. However, -holy -crap.-
There are giant weasels in kobold caves, which are something of a lowbie staple dungeon. I'm still okay with bleeding damage in lowbie dungeons, but the disorienting, thematically inconsistent element is that their bleed damage continues to very, very quickly whittle you down once you've been knocked unconscious/below 1. My PC was knocked to 0 (by the bleed, in fact, I think) and then hopelessly bled out along with her three other party members. Had the bleed been the sort to stop at 0, it might not have been a total party wipe - but even that's not truly important. What I find important is that Ravenloft's system for handling dying, which I like very much, does not align with what happens when you die to bleeding damage like this.
Ravenloft's dying system is nicely-developed, and I don't think this kind of bleeding damage is healthy for the expectations of new players.
I'm not sure if this necessarily belongs in" Erroneous and ineffective creatures.", but it certainly strikes me as "erroneous" given the way dying works in Ravenloft in all other cases (in my experience).