wow nice patch =)
might not be many useless units left.. these units are hard to make cost with but can sometimes still work:
reef ~ im not sure its worth the cost even with disarm
skuttle ~ in the hands of a pro its op com killer ~ in the hands of a noob its unlikely to ever succeed
its super hard to use and cannot normally kill felon. maybe the hardest to use of all units. even harder then imp, but still kinda good.
newton ~ sometimes its op on a hill. but in most situations its the worst porc choice
blastwing ~ they often seem to fail as cloaked mines so i never see them past the defender turret spam counters
i like the idea of them as mines to counter cloaks / raiders but they seem to be a bit weak as mines because the fire is mostly just localized often not even killing glaves. so units can just pass by unscathed. if the cloaked mine state had more oomf then they might not become ignored after 5 mins
the afterburn is 1 second @ 15 damage + 80 blast = 95 damage for 55 metal
so 2 will kill a glave when used as a mine.. but will cost 45 metal more then the glave
so only if you put two in the path of a group of glaves can it work and even then its just not very good at this because they will kill themselves and then the enemy will adapt and scout with single units.. even flea makes cost vs them as mines