Is Geo spy any Good?

True, but spy can also apply tm for himself though. You just need to wait for the match to get going. The benefit of the jawa team is engineer gives crit chance up and then allows all jawas to move and drop their debuffs. By the time spy goes, you're conservatively looking at a combined 3 buffs/debuffs to dispel and grant extra damage. Might also look at 2-3 thermal detonators on the target if they aoe'd first. Just thinking out loud here