Originally Posted by
nucleosidase
250k Marriott points = 132k United miles or 120k AA/Aeroplan/Alaska miles + 5 nights in a category 6 hotel
So, assuming you can get to 250k (which might be a tall order but spouses can combine their points for a redemption), each card is 24-26k miles.
FYI - In case anyone wanted to pool points with their spouse for a huge redemption, Marriott is now capping annual transfers at 50K per person.