Which games exactly throw more bodies at you as you up the difficulty level? I can't remember any since the days of Doom.
I WISH games would do this, because more stuff to shoot/hack/assassinate / otherwise take out would be awesome.
Instead, every game just raises every enemy's hp by 200%, figuring that if it takes you longer to take someone out, that's considered to be "more difficult."
It's the laziest fucking approach to game development possible.
(I gotta say that I kinda enjoyed ME2's approach to difficulty, by adding layers of protection to enemies, although plenty of munchkins whined that their adepts now were no longer Supreme Gods of the battlefields.)
As for regenerating health, really, that's the only thing he can think of that impacts the skill factor of gaming? Every game has been getting dumbed down, because we keep getting more and more new gamers who find everything too hard and too long, and who basically want two hour games where they just press X, and the game tells them "YOU FUCKING ROCK, MAN!"
/old man rant.