I really enjoyed all of the Ori aspects of The Ark of Truth
, I thought it was a solid (if somewhat convenient, though pretty much all of SG-1's nemeses were vanquished thanks to a bunch of conveniences) ending to the storyline. But I completely agree with The Wormhole
about the Replicator subplot. I was never a fan of the Replicators to begin with, but there was absolutely no need to add them into AoT. It's like they came up with the A-plot and then realized they had a bunch of room left over, so they added in this idiotic Replicator B-plot to fill out the running time.
The scene between Teal'c and Tomin is one of my favorite scenes in the entire franchise.