“I absolutely wish we could have spent more time polishing Underworld, I take my share of responsibility of aiming so high that we had a reduced ability to spend time on polish.” said Lindstrom.
“I cut content from the game and it later turned out to be possible to use in DLC, for which I was happy, it was a coincidence that we had some candidate content for DLC when the deal was made. I was glad for it, otherwise the stuff I had to cut out would have never seen the light of day.”
More can be seen here.