Nice to see some divergent opinions here!

I've listened to the whole album probably seven or eight times now. As I think I said earlier, I thought this album was destined to be TLOL Part 2. In terms of the overall tempo and arrangements by Claus Ogerman, I guess it is. But its really a whole lot more. For one, Diana has been through enormous life experiences since 2001, with extreme highs and lows. The emotions of the past 8 years come through. I also think that this was one of her most challenging albums in terms of vocals. Very exposed, and she stretches the limit of her range on So Nice.
I suggest its best to listen to this album very closely, through headphones with minimal distraction if possible. Not while driving, for example. Only then can you really pay attention to the subtleties of her performance. She does an amazing job.
Anyway, I can understand the desire for a more straight-ahead, swinging jazz album. I wouldn't mind that either. But Quiet Nights is quite an achievement in Diana's career.