As a counter-point: We're usually late, fixed seating people. (Known as Main seating in HAL's booking system.) We've always - and I mean always - had excellent service in the MDR.
We've done Club Orange once, on the Nieuw Statendam in December 2023. We had great service on the first night from our waiter, Tre. We told the CO supervisor that Tre did an excellent job and requested to sit at one of his tables going forward. Tre was "our guy" for most every meal in the CO dining room for the entire trip. In essence, we recreated the fixed dining experience in Club Orange. We even wound up with the same table 4 out of 5 nights.
We do like the extra entrée choices that come with Club Orange, but we'd be just as happy with late, fixed dining in the MDR. (I've heard reports that the MDR is noisy on the Pinnacle Class ships. Not having experienced the MDR on the Nieuw Statendam, I can't really comment on that.