Wotlk Wasn't a completely New Mmo where people had to Learn classes and bosses.
Wrath also wasn't a new MMO trying to capture people who haven't played MMOs before (It just happened that way and that's why Normal modes were so easy)
SW is trying to capture new people. its good that the first tier isn't overbearing. new people would get discouraged. The Vets can handle an easier tier (look at Dragon Soul) but the new people won't stick around if they can't raid. Early Cata is an example of that.