I have no intention of striaght up NERFing the mage for summoning spirits. I'm just trying to find ways to handle a force six spirit without having to throw a Mage in every fight. I don't want to dump 10 ghouls on it and then have the spirit gone and 10 ghouls turning to attack the 3 Runners standing behined it. I'm also not sure the mage would survive a ghoul with an ak98 full of APDS ammo after it cuts his spirit in half.
You throw spirits against mages, not mages against spirits. The reason is because of critter powers, which are not subject to counterspelling. At force 8 a single spirit will Critter Power a mage into unconsciousness in one round (foce 6 is close behind).
Taking care of spirits is the job of your gunbunny (or other damage dealer). A Force 6 spirit is not that hard to deal with: it only has 12 hardened armor. Getting 12 raw damage (not burst bonus) isn't terribly difficult (and you need less damage per point of armor piercing).
Yes, anything that takes out a spirit is going to be trouble for the party, but this is a good thing. It forces them to think, and maybe even run away and re-think their strategy. Also keep in mind that anything that takes out their spirits should be taking damage, so even if the spirit is dead, the thing (or things) that killed it aren't going to be in good shape.