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like the title says, ild love a good mech/battletech style mmo
long range lasers
magnetic rail gun guass rifles
heavy damage close range regular/shotgun cannons
particle projection weapons (lightning guns)
and missiles that can be shot down by anti missile systems in route to target (either laser based that burn power and make heat of ammo based that have limited shots, or be able to mount some of each!)
multiple hit detection sectors, arms get shot off when damaged enough, legs too, lose both legs and well, youre buggered, get shot by a big enough blast to the cockpit such that the armor fails, game over, no ejection, gotta wait for clone to be brought up to speed!
jump jet capable bots for scouting
big heavy slow ones bristling with guns and armor to defend and assault things
moderate sizes for flexible combat scenarios!
perpetuum had potential, they had guass and regular guns, lasers and missiles, but in that game you dont aim, its eve style lock and auto fire, so that wont do. the game needs to have a reticle that moves with the mouse/joystick like in mw3 and the weapons follow it, missiles being the weapon that will track to target once locked.
also they could incorporate a system similar to potbs control area, multiple planets in the sector with various factory facilities in the warzone of your choice, tons of potential here for pvp.