The worst breakfast I ever had was at a Courtyard Marriott that was under renovation. Since then, I made a policy to find the best local breakfast diner any place I went, even if the hotel breakfast was included.
That was how I learned Boston has no good breakfast spots.
Also the hotel only served breakfast on certain days of the week? What the fuck is that about. But they gave me a free glass of wine when I got back to the hotel one night.