I'd played through Oblivion over the spring-summer of 2006 with only a few mods, and none that added new content or messed with level'd lists. I just recently re-installed with OOO and MMM, along with a few other realism mods added in. The one thing I found most apparent was how slowly I was leveling and, of course, the near absence of player-centric level'd creatures/NPCs.
So, on pretty much my first trip outside IC, I head off to Bruma to visit the fence for the Thieves Guild quests. Getting distracted by prancing deer outside the city gates I wander off just west of the walls. You can imagine my surprise when, at lvl 2, I am faced with a rather large Frost Minotaur (I think). It was no more than a 100m west of the Bruma walls and was making a terrible mess of the region. A myriad of expired bandits and such lay scattered about the snowy terrain, with a couple of Imperial Foresters tossed in for good measure. It didn't have a very large roaming path, but I believe the MMM mod had its combatants running fleeing in all sorts of directions, dragging the Minotaur into one encounter after another for the better part of 15 minutes.
I'd had the wherewithal to save before attempting to goad it, and good thing too as it was more than capable of one-shotting me into a large frothing cloud of red. After a couple of attempts I managed to drag it back to Bruma without running out of fatigue and collapsing in a pile at it's feet (thanks to the Real Fatigue mod!). Through the gate, up the stairs, into the castle, and straight for the barracks. Once inside, I kited the foul beastie for no more than 20s and the dozen or so guards beating on the Minotaur managed to best it. It was so hell-bent on ending my life that I don't believe it tried once to defend itself against the formidable castle guard.
The loot was not worth the effort, but it sure was exciting! And I felt better about venturing west of Bruma for the false Vampire killer quest (sorry, can't recall the actual name), but the region was deathly quiet after that. Not a soul to be found.
After another evening of play I'm now level 3, only half way to level 4, and I've not encounter anything so menacing, but I have stumbled across plenty of encounters that are still far beyond my capabilities. Yay for location-centric leveling!