ceemdee: I think regen allows them to design levels a bit more dynamically. They don't have to worry about the health packs being spaced out based on pre-set enemy locations. They can also focus on making each encounter more of an individual challenge since even the weakest enemy can often kill you if you're not careful.
Maybe. But its a little unrealistic being shot by few enemies, killing them, waiting few seconds, being shot by other enemies, killing them, waiting few seconds... Again and again this thing.
But I guess they must make life even easier for those who don't know how to freaking aim at enemies (given that most shooters have auto aim crap on consoles). Now with this regeneration system, they won't even have to "worry" about themselves, just press the freaking button on the controller to finish the game. :/