I must say this episode was far better than the last episode "The Scourge." It contained plenty of special effects, action, and more information on the Ancients.
The storyline behind Merlin retaking human form after ascending is quite intriguing, but the weapon that he supposedly has created that, can destroy ascended beings is a bit out there. Of course SG1 needs a means of protecting Earth and galaxy, but such a weapon seems impossible.
It was most unfortunate for the Sodan to be wipped out, but that was inevitable. Looking at Volnek, we can clearly see that the Orii have bestowed their Priors with the same advanced abilites as the Ancient technology as SG1 has encountered in the past. Now Earth will have to battle the new Orii superships and the return of Vala. Good luck SG1!