I have listened to the album over ten times. My first impression was similar to my first two listens through The "Love You" album. It sounded oddly good in parts but Brian's voice sounded different as well. Then it broke through and I truly believe as similarly people were down on "Love You" then realized it's genius so will go "Lucky Old Sun". It is a song cycle meant to be heard as one song. If people don't appreciate how really good it is they need to listen more and critique less.
I just listened again, with headphones.
This is Brian Wilson saying to the world I'm back, this time it's for real. He demonstrates everything and anything is still possible and I believe "That Lucky Old Sun" is a genuine step forward into his modular recording technique. An honest artistic statement from a man who has lived a life with more downs then ups. A statement that reinforces every life is worth living.