If a hotel routinely closes its pool for a season, that should absolutely be posted clearly on the website. Indeed, it's absurd for a DC pool to close at the end of August, but if they posted this fact on their site I could live with it.

If a hotel closes a pool for major maintenance, it should post the dates on its website as soon as they are known. Then, fire off an email blast to affected guests who had already booked during that period. I don't go *back* to Marriott.com and keep looking at the website every day leading up to a stay. A simple email would be appropriate.

If the pool closes the day before you arrive or while you're there because something broke, then I probably wouldn't complain as long as I felt like the hotel was treating it as an important matter and resolving as quickly as possible. This is where a cavalier attitude would piss me off moreso than the fact that unexpected maintenance needed to happen...