Can't say I'm not disappointed, but my position's quite different: I discovered PACG at a convention recently, playing one S&S scenario and one WotR scenario with my Warrior Class Deck, and fell in love with it immediately.
Being a big fan of Egyptian-themed fantasy, I was really looking forward to Mummy's Mask being the first core set I would add to my collection and introduce to my group. I was really anticipating it, reading and re-reading the AP while I waited for release.
Now it looks like I'll have to get S&S or WotR to tide me over in the meantime, and get tons of play out of that first. Sneaky Paizo!