Halo 3 - Shield System
- Automatic, with no input on the part of the player.
- Unlimited use, with no maximum cap on how many times it can recharge in a single encounter/mission/chapter.
- Independent of other resources; no need for health kits, special abilities, or the like.
- No secondary use.
D&D 4th Edition - Healing Surge
- Manual, with the player having to choose to spend a healing surge.
- Limited use, with a finite amount that can be spent in a single day.
- Dependent on other resources; potions or powers are required to use; the one exception is a five-minute rest to use them.
- Can be used to fuel abilities other than healing, such as magic items.
The only real point of similarity is that the shield's "don't take damage for several seconds" recharge quality can be compared to the healing surge's "spend as many as you want during a five-minute rest," since they both allow you to heal to full outside of combat (technically, the shield recharges inside of combat). Other than that, they are worlds apart.
This claim also doesn't deal with the fact that healing surges are far more akin to the Earthdawn healing system than any video game.