FUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU Bethesda's level scaling. I have no problem with level scaling in general. I have no problem with dynamic difficulty systems in general. Even Baldur's Gate II and Morrowind had it to some degree.
But those games don't load me into pairs of deathclaws everytime I go to turn in fingers. Nor does it populate the world with Albino Radscorpions. AAAAAAAAAAAAAARRRRRRRRRRRRGGGGGGGGGGGGHHHHHHHHHHH Though Cliff racers got really annoying after a while.
Part of the problem is probably Fallout 3's respawning system. They respawn where they died, instead of respawning where they originally spawned. So if the deathclaws (which seem to have replaced giant radscorpions as spawning at this location) die on top of the fast travel point, they'll be there the next time. And they're too heavy to drag the corpses away.
And stop killing my invested merchants, guys. If I see them, I just know I'm going to have to escort them for a few minutes before I can break for it.