Specifically, the laser trip mines and the holodukes. Both of these things made the multiplayer alot better but they have never become popular. The only other game i've seen with something like a trip mine is the proximity mine in GOldeneye, and I dont care for console games. No game I've come across has used something like the holoduke at all. Some games have used jetpacks but even that seems to have died off. I think multiplayer FPS would be better if they brought these back.