FirePluk is not subtle, that would be the most obvious way to look like you threw the game.
Weaver, flea, venom, infiltrator, and crabe are all top tier.
Weaver: You need the AT, efficient mobile BP, and build range for winning the frontline.
Flea: You need the scout, screeener, passive LOS, and early harrass.
Venom: You need a small mobile means of dealing with cheese and aggression. One venom stops the com drop you scout with your fleas, or the jack rush, or any number of raiders.
Infiltrator: You need to stop very specific large threats.
Crabe: Midgame porc dominator with riot sidearm.
It's really a very good factory for big teams, allowing you the ability to decisively slam particular opposing plays, then transitioning into a solid push once the gamestate has settled. If you keep your army of noobs safe they are far more likely to do something productive. The only thing I miss when playing spiders in big teams is they don't have a good mobile AA, but you have the mobile BP to make static AA wherever you need it.