Look the arguements can go either way since we do not know the extent of the shivan controled space. However if the shivans would of been the god like creatures some of the ppl here make them out to be then the GTVA should o been wiped out in less then 1 hour.
Yet 2 times in a row the GTVA ha posponed its destruction and in the first FS even took out what was deemed as an indestructible ship.
It's evident the Shivans weren't serious about wiping out the GTVA on either attempt. In FS1, they sent in the Lucifer... If they were serious during FS1, they'd have sent in at least a few Sathanes, but all they sent was one single Lucifer and a few Demons (without beams, no less). Even if the Lucifer fleet was all that the Shivans could muster at that point, it still means that we're seeing their full potential.
In FS2, the Shivans didn't even send a single juggernaut to attack Vega or Epsilon Pegasi. They were all dicking around the star. If they were serious, there would be no bloody way the GTVA could survive against 80 juggernauts.
So, the Shivans could be god-like creatures, but just can't be be assed to wipe out the GTVA.