Level 37 and no it doesn’t make anyone corpse camp. What would you camp the corpse for? The only corpse you produce is either a quick trapper to undome yourself or lazarus himself, which is a gain.
If you have lazarus down you try to get him the moment he is ressed again for a quick second strike or if you feel sorry for the other team you disengage.
There isn’t really much to talk about, lazarus himself says that he isn’t a doctor(medic)
On a sidenote his healing burst isn’t any better than vals or cairas. I don’t know what makes you think that lazarus works against a good monster but it really doesn’t. You don’t need to camp you can sniff lazarus 24/7 and if he vanishes – where is he gonna go? That is beside the point though, no reason to simply slap lazarus until he dies, which without hanks takes a couple of seconds since invisibility doesn’t work in a defensive situation either. The monster can at any time make a go for lazarus who can only use his fuel and is then forced to cloak, which in melee range has no real effect anymore.