I like the original Half-life's system. You've got med-kit stations spread around the Black Mesa facility, and you can draw about 40 HP from each before it's depleted, but you have to stand and push the use button by it and wait for it to fill up.
That being said, I also like Halo: CE's system from experience, and Resistance/far cry 2's respective systems from what I heard
That being said, I also like Halo: CE's system from experience, and Resistance/far cry 2's respective systems from what I heard