I'm going to go out on a limb and say Droideka is NOT going to be an absolute god.
Seriously, I agree with much of the OP. To begin, the droid supports for the GG team are each individually bugged (some with more than 1 bug), so sorting this out could take a long time. Also, droideka's own worst enemy is itself - if he's fast, he doesn't build up enough charge to do decent damage, if he's slow, he builds up charge, but doesn't attack often enough to make a difference. His kit actually works against itself.
And GG's special hurts his team more than it helps him. He doesn't build up enough health - and the entire unique only makes him the clear target. Throwing up taunts on other allies whom he has weakened throughout the battle only makes it worse - not better.
Basically, it looks like the GG "dream team" that CG featured in the GC vids was either not reflective of the actual synergies (or lack thereof) within their REAL kits - or the current versions in game are so badly bugged (and in numerous ways) that it could take weeks to fix. And even then, are they going to actually be as effective as the ones in the videos? Or were those GG teams facing undergeared/unmodded Revan teams?