That's basically the only route I do LH F on (thank you, UA Plus Points), especially with no F to India now. Never had an experience like this - in fact my experiences of late have been really positive with respect to service.

The one that's galling to me is #2 in your list. The other two, while not cool, I can at least see how they might have happened. But it is utterly insane for all meal service to be suspended for 30 minutes because the purser is talking to someone. I can barely fathom it. There's enough space in F on the 748 to step out of the aisle for a second as someone walks by.