Why is the client so big? I don't get it.
WoW's file size is about 20 GB, while LoL is sitting at about 6GB.
But in WoW, there's 5 giant continents, countless models of mobs, foliage, items, objects... then textures for all of these... hours and hours of background music and voices...
In LoL, there's 3 small maps, some 70 (guessing?) champions with their skins, some icons, few monster models and some music and sounds.