Why is that something to get outraged about?
I feel its really underutilizing one of the main mechanics. Maybe its not the key mechanic of the new expansion, but it looks like it was as one.
GvG had 40+ mechs. TGT had 21 inspire cards. C'Thun had 18 cards.
The factions have 9 cards total. And it seems to me a pretty interesting mechanic. But maybe factions are the Joust of Gadgetzan, and are just a secondary mechanic for the expansion, where the main theme hasn't been revealed yet.