I loved Mass Effect 3. I thought it was a great way to end a wonderful story and I spent as much time as possible savouring the final journey of Shepard and the crew of the Normandy, completing every side quest, every conversational strand and following every interpersonal relationship to its ultimate limit.
Likewise I loved Skyrim, albeit for other reasons. The story wasn’t particularly great but the sense of place was superb, with the rewards for exploration being constantly surprising and tangible. Over 180 or so hours I explored every inch of the world, investigating every cave, climbing every mountain and opening every door, portcullis and chest I came across.
The thing is, however, that I have had absolutely no impetus to play any of the DLC for either title, though admittedly for quite different reasons.