ps i dont think you can consider perfect meteorb gear without having stormshield in the mix. If you agree then skip
Stormshield allows the meteorb to play a different style. Vs alot of enemy in 8 player games with ss you can teleport into (on the edge really) packs getting your merc into the action faster. If he is well equiped (eg with reapers to decrep em and hitting 9 frames attack) he will be inflicting damage fast and stunning enemy. During this time my meteor will be on route (if i think they will survive 2 fireballs which most dont) while I soften up with a couple of statics then begin the fireballs to stun - by the time the meteor lands im off into the next pack to repeat. Done at high speed you can really tear up enemy.
Fire immunes i just swap to orb/static and if fire and cold immune ill static and let merc finish (maybe some TK if hes struggling) while I clean up another mob.
Multiple immunes calls for fireballs to the cold immunes between orbs directed at the fire immues etc. With some praccy you can work the angles and hurd the little sheep into packs to be decimated (your merc is your sheepdog here)
With SS you can play alot more agressive and therefore the killing speed goes way up (make sure you hit a good fhr frame though but treks and a few fhr sc's will do the trick).
Need to be fast on the keys ( i use a nostromo speedpad for 1 button spell spaming but hey).
Any other shield and you will be spending more time sucking reds than killing.....