Yes, I know about the MegaBonus (I hate to be a "I am aPlat with so many nights bragger but as I pay for all my stays for leisure and am on 98 nights so far, I am always aware of offers!), but there are usually other offers as well as this. Through summer there was the 20% off rates (even though it was Advance Purchase), spring there were 3 for 2 offers as well as a 20% off as well as Marriott Reward rates with free dinners etc.
I am just commenting on the lack of worthwhile weekend offers.