The main problem of the Inquisitor in my opinion are two:
1 - Their lack of character development. The story expands around them, but the Inquisitor never does that him/herself. You never feel like they grow as a person, that they changed and are more mature now. My warden was just an noble kid that rarely ventured out of the Cousland castle. By the end of witch hunt, he was the saviour of Ferelden, slayer of the Archdemon and a father. I mean, my Inquisitor also did a lot of impressive stuff. But I never felt like that changed him.
2 - The lack of a origin. We never see the Inquisitor life before the conclave, we never see them interacting with family or friends. And that was a huge bummer. Both my Warden and Hawke wouldn't have half the amount of personality and charisma if not for me being able to see were they come from, their lives before becoming heroes. It gives a sense of belonging, and it helps when creating some basic character traits for my protagonists.
In short, I didn't like the Inquisitor. They felt too impersonal for me.
It's strange that one has to explain the concept of roleplaying in a RPG game.
Not once did I ever believe the Inquisitor was a hero or a leader. Not once was I ever convinced that he/she could run the Inquisition nor that he/she was actually running it. It was an odd experience in which BioWare tried to give us the illusion that we actually had real power and influence without actually having anything at all.
I can relate in the sense that I felt similarly when it comes to the advisors. "These people are the best at what they do, who am I to lead anything?"
And yet you do. If the advisors ignored your decisions and just did whatever they pleased, I'd agree that it seems like you don't run anything. But every important step was your call.
Even when the stakes are the future of a nation, they still defer to the Inquisitor's decision on who should remain or ascend to the throne.
There is a multitude of reasons why the Inquisitor is horrible, yes. A multitude of complaints born from not paying any attention to the game.
Not all are invalid, of course, and this protagonist isn't perfect. But plenty of these have me shaking my head like "Did you really play it?"
Anyhow, this is the last time I'm replying. Not because I oppose debate, but because dragging this any further would defeat the whole point of making a positive thread about the Inquisitor. Soon enough the main focus would become how "awful" s/he is.