I for one want more challenging enemies and larger enemies to fight. Most critters were small with the exception of just a few rare monsters in the wasteland in fallout 3 and new Vegas. Most creatures were also pretty easy to kill with the right weapon. There is just something about a massive and tough enemy that makes you cautious to venture into certain areas.
If I could have 2 creatures one would a small and hard to kill creature that could climb walls and was extremely stealthy and fast. As a large enemy I would love a massive water creature (squid meets crab).
Do you think we will see large enemies and more challenging enemies in fo4? If you could put a creature into the game via mod or the base game or future dlc what would it be?

. I meant that uh... example: A regular supermutant shoots you in the head with a hunting rifle, causing 70 damage. Suddenly, a supermutant overload comes around, shoots you in the head with the same hunting rifle (which he took from the dead body if his commender you just killed) for 300 damage.