Dragon Age: Origins was excellent and did not feel dumbed down
Yes it did. The interesting strategic combat of BG2:TOB was reduced to pop-a-mole against dull indistinguishable enemies. Fighting was dumbed down to button mashing. It is probably one of the most dumbed down game in history compared to its predecessors. Took me all of about 5 minutes to get bored with it, but I still play BG2:ToB all the way through at least once a year because the combat is just so much fun. Particularly with mods like Sword Coast Strategems that make the enemies smarter.
A true sequel to BG2 is hopefully being made by Obsidian in the form of Pillars of Eternity.