It's not legendary. Nearly anyone could do it. Just camp in vents, don't take risk, find one/two/three crewmember with pistols at best, retreat when you are wounded to heal on weeds and here you go.
More than year ago lurker was for unrobust players. You could achieve the same results with drone and it was impressive, becouse it required a lot of skill.
It's like with Preds and Synths. Their power is too great to be let loose, so they have rules they have to obey. Lurker isn't that OP against armored marines, but he is OP against peashooter crew.
Why we are punishing preds for going total murderboing? If they are robust with cloak and plasmacaster, why they are punished for it? Why synths are punished for starting fights? If synth player is robust, then let him loose on the hive with machete and riot shield. Then lets celebrate it.
Shipside is supposed to be for RP, for people who don't enjoy fighting benos and you want to cut their fun with Elder Lurker (69) who posses two braincells and will run from any more armoured crew becouse vents are his domain.
Again: Wiping out Alamyer crew as a lurker isn't very hard. By being a "pussy" anyone could achieve that.
Try to do it with caste that can't fit into vents. If you menage to do that, this is worth celebrating.