Mines: It would slow down the pace of the game too much, and could probably be easily abused. If it does little damage, it doesn't add anything to the game and just becomes an annoyance. I think I can speak on behalf of most people here when I say that grenades should be the only explosive weapons in this game.
Smoke grenades: Might put some older systems under some stress, and with the amount of grenades everywhere, they could also get a bit annoying. Sticky grenades, though, could possibly work.
Smoke grenades: Might put some older systems under some stress, and with the amount of grenades everywhere, they could also get a bit annoying. Sticky grenades, though, could possibly work.