I came across this article on the Excapist by Yahtzee and it pretty much sums up how I feel about regenerating health in video games.

I was wondering... what Game Mechanics do you think should not have been implemented and which ones do you think were absolutely awesome?

For example:
I don't like regenerating health in FPS's as I think that it disconnects me from the battle (I sit behind a rock for a few second and I'm suddenly fine).

I do like the time-powers from the Prince of Persia games. I think the way the games were implemented was fantastic and I especially liked that you couldn't do it indefinitely (you needed sand to operate the dagger).

So, what do you guys think?