I actually like it very much that Solas managed to trick the Inquisition, because nothing in life goes 100% smoothly. Everyone has their weaknesses and there is always someone who is better than you, be it intelligence, knowledge, strength etc.
So playing a character that always saves the world gets kind of boring. I want to see the protagonist struggle and stumble and fail and doubt himself/herself, because this is human and real. Overcoming all this, maybe with the help of his/her friends and allies, makes it all the more rewarding.
I think that the rise and success of the Inquisition was pretty much a no-brainer. You have Leliana, who is a brilliant spymaster, you have Josephine, who is a brilliant ambassador, you have Cullen, who is a brilliant commander and military trainer, and you and your companions defeat everyone with ease. Corypheus and his goons never feel like a true threat and before you know it, you have defeated him.
Well, this is probably because Dragon Age lacks the epicness of Mass Effect. The advisors push some chess pieces across the map, you see a handful of spies and soldiers in a seconds long cutscene and then in the Arbor Wilds there are groups of 3 vs 3 scuffling. I didn't get that this was supposed to be the "big fight" until it was said that Corypheus had lost his army in the Arbor Wilds. It felt more like a skirmish.
So being owned by Solas really felt refreshing after all this. It showed that the Inquisition was not this indomitable, incorruptible superpower. I only wish we could've seen that in between.