That the Ori beings seem to be a combo of 3 groups so far in the SG universe. Well they're Ancients and ascended ones at that. They also suck the life force of their followers similar to the Wraith. They also have the arrogance and the "worship me for I am holy... and just plain better than you" mentality of the Goa'uld.
So you could say that they are a combo of the Wraith and Goa'uld and to make them extra bad.... TBTB made them into the evil version of the Alterans.
Im just hoping their ships isn't made up of cell-block machines like something similar to the Replicators.