I am sure if you log a complaint, they will be calling you in a few days and offer some form of miles or MCO. they usually do to FF members.
The 772 is rather old an faded, and seating not comfortable a few generations back. I was equally shocked coming back from BKK, after flying out on the 773. Still, by Summer this Year the whole 777 fleet will be fitted with the New World Business Class, observed by BT forum readers as offering more space than on BA’s First class, and of course, a better usual KLM Dutch service.