Here's a thing.
BluRay Audio discs cost around 4 to 5 times the amount a DVD-A/V will cost because of the massive additional complexity involved with the authoring as well as the mandatory, crippled AACS "copy protection" system.
What you do get is dr4amatically better graphics & visuals.
What you do *not* get is any improvement in audio quality whatsoever compared to an Audio-capable DVD player, and depending on your BluRay player you may well not actually be listening to the stream you think you are. Why? Well, basically neither DTS-HD MAS or Dolby True HD (MLP Lossless by any other name) are actually supported mandatorily in lossless - the mandatory component is the hidden core audio stream. The lights can be on but you may well be actually hearing DTS Core (16/48) or AC3 - seriously. The Dolby True HD light can be on & you may be playing AC3 as only that core stream is supported by mandate - the lossless are optional.
The only lossless 5.1 guaranteed on BD is LPCM.
Why did this not include MLP streams? I know it had nothing to do with available space, and cannot say any more than that.
Shame that space wasn't the reason these weren't DVD-As (as advertised). I know it is the truth that every once in a while there will be a DVD that can't fit the audio layer on it, but it's such a waste when there's a missed opportunity like this. I hope that everyone who is unhappy with the sets returns them as a statement.