I didn't even play Baldur's Gate so I can't tell you.
But to say that Dragon Age Origins isn't action RPG is ridiculous. Honestly I'm in no mood to argue about that.
How are you defining "action?" Because I suspect you're defining it differently than the rest of us.
To me, "action" means based on twitch mechanics--you being able to click a button fast enough, for example. As such, DA:O was not an action RPG. At all. In any way whatsoever. Neither was DA ][.
This multiplayer-inspired change to the game's mechanics, however, creates a situation where your combat prowess is based on twitch mechanics--you being able to click a button fast enough.
This is not like DA:O. Period. That's not debatable.
Now, the fact that auto-attack exists in tactical cam means there's a fortunate alternative. However, this is still, indisputably, a fundamental change in game mechanics.