The way I see it, the Monster thing
could be a pretty cool lore and "role playing" type tool. Imagine playing a Froglok in Guk when the first frogloks hit the curse that infects Lower Guk who has to find his way to the surface to warn the others. Or a goblin in Solusek when the gnomes started exploring and mining who's tasked with spying or sabotage. The initial reactions of the kobold nobles in Solusek when one day a dragon moved in and declared himself lord. A bunch of possibilities to revisit events in Norrath's history through the eyes of the creatures they affected instead of as a PC hewing through goblins looking for loot.
Unfortunately, I doubt that'll really be the case. I guess I'm embittered by the Omens "tasks" that were some of the most asinine fill-in-the-blank plots imaginable:
"There's trouble afoot with kidnappings in S. Karana! Explore the gnoll spire. Oh, no! You've been ambushed by beetles who want to stop your mission! That was close.. we know who's behind it now so kill ten elephant calves to stop them..."
Somehow I'm not expecting the monster missions to be much better.