Too me that sounds to boring, hopefully it has some kind of slowing effect on who it hits, allowing the heavy really define the front lines, nothing to drastic that is. Or to better suit the heavy without the medic, make him have like a banner weapon he can use (secondary) that could temporarily (non stackable, one per heavy? with one more per 2 kills?) give a bonus to those around it once you implant it on the ground. Just toying some ideas here.