I don't think it's too easy
Then again I don't think it's too hard either provided that you are careful and plan ahead (and take advantage of the dumb AI)
There are actual hordes of enemies in this game. Basically Obsidian did something that Bethesda hasn't done, create hordes that actually pose a threat provided you are not careful.
I second this. Radscorpions are tough until the upper levels, but early on you are dead unless you can find a rock to climb on. This brings me to the most immersive thing I have experienced in a fallout game thus far:
So this was very early on in the game VH/HC. I was going south from Prim to go to the NCR camp (you know why). I was trying to cut the corner and I ran into some Jackals which took atleast half of my stimpacks and crippled a leg. It turns into night, and I am off of the road. I get a constant stream of feral ghouls, that manage to cripple every part of me except for one arm and soak up all of my 9mm ammo. So I wait out the night because I'm sick of ghouls. In the morning all I have as far as gund go is a beat up .357 magnum and a varmint rifle with like 30 shots. I then run into a hoard of radscorpions that would have killed me except I climbed on a well placed rock and took some pot-shots at them. By now I was dehydrated and had no water or anything to hydrate myself so I had to get out of there. I took a hydra and sprinted back to the road and took shelter in tha gas station and found shelter.
This was crazy becuase stuff like this never happened in FO3. This one part impressed me more than all of FO3 did total, but since then I is easy as long as you stay on the beaten path.