In the old school RPGs, you would take your character out and seek various things in the environment that you could change. You have agency, you have freedom. You have to take an active role if you want to change the world, save the princess, or just find a way to survive.
In KOTOR, it feels like you may as well be standing still. You play an assembly line worker who has to make a certain quota of Force-related crises before he can finish his shift. The only things that happen are thing things that were scripted to happen. Your role is prescribed. You are Revan, and you can't be anyone else. You couldn't make your own story or forge your own path, you couldn't even try to follow two branches of the story simultaneously; there were no forks in the road. You just choose whether or not you want the people around you to sing about lollipops and rainbows, or about moping and self-cutting.
This sort of treadmill feeling got even worse in Mass Effect, where actually interacting with the game felt like waiting ten minutes to download the next page of a comic book.
DA:O felt like an inexplicable reversal of the removal of freedoms you saw in KOTOR. And no more of the lame dialog wheel! Things were looking up! Maybe the next Bioware title would have both an enjoyable story and gameplay that didn't feel stifling!