I will use Tangerine Dream as my reference. I have quite a few albums and I listened to most of them. I listen for creative themes, song construction and muscianship. Some albums where down right boring others may have great moments but not enough to call an album great. My favorite album is Livemiles but other listeners may not share my opinion, also like Poland, Architecture in Motion, Le Parc, Miracle Mile, Melrose. And the compilation or sort of montage of their career Live in Lisbon IMO is an excellent 3 hour listen.
Liking Tangerine Dream is learned as I have been listening to them since the early 80's. I don't think everyone can get into it with short exposure.