I think the question is not 'What is an rpg?' so much as it is 'will our choices matter or we be railroaded as transparently as we were in DA2?'
I don't think ME2 was anywhere near as bad as DA2, but I do agree DA2 would have worked better as a novel. Anders always completes his mission, that one anti-Qunari sister always screws you over, and the serial killer is always given free reign until it is too late.
Will DAI do well? I hope so, but I'm still going to wait until after it has come out to see.
They've had a much longer amount of time to make the game than DA2, and initial gameplay demos look promising. Hopefully this time we will be able to do more with our character than simply act as a soundboard responding to unalterable events, but we will see.