Something that really bothers me is that far too many people approach an artists work as though the artist ought to be doing what the audience wants, rather than simply creating things for themselves, and hoping the audience can open their ears and perhaps even learn something new about themselves, the artist, or even music itself.
No this is not Chariots of Fire or Blade Runner. Its purpose is very different, and it ws created during the formative years of Vangelis. What's wrong with that?
So yes, if you only know Chariots of Fire, then you might be a tad surprised by the lack of humable melodies. But this one is something else entirely. In many ways it's more, deeper, and asks more of its audience. Some might call it "experimental" - which I won't disagree with too much.
But it's none the worse for that.
Perhaps not essential - fair enough. But to me it's entirely worthy, and if you have an open mind or what to hear something different, this might well do nicely.
If you like this then he took it to the nth degree with Invisible Connections, and even more abstract piece that I sometimes listen too.