Are there really 100 unique tracks or most of those are variations of each other? Like there's only one battle theme in ARR, but with slight variations according to region it takes place in, same with FATEs.
Let's just say it's a matter of preferences, because most of those except Against the Wind and the very first minute of To the Sun are what I'd call bland. In MoP OST I can easily name Heart of Pandaria, Why do We Fight, Way of the Monk, The August Celestials, Shado-Pan, The Golden Lotus and Kul Tiras as far better themes. Same with WoD: The Foundry, Sacrifice, Khadgar, Tides of War, Family.