I don't know, I have been listening to instrumental/ambient/chillout music for many years, so Journey's music was nothing special to me. I agree that it was well synced, but as standalone music? I wouldn't give it any awards.
Again probably just a question of taste, the music won multiple awards, the ost has 7 million views on YouTube. Apotheosis is my favourite.
I think the music was perfect for the type of game, but now that I think more about it, it was actually shocking that an indie game had such a good ost.