My main attraction to an essentials only game is the reset on the wacky races back to more traditional D&D races. I was getting a bit tired of telling "a goliath, a minotaur, a wilden, a warforged and a dragonborn walk into a bar" jokes.
I started with BECMI and still like the idea of Humans, Halflings, Dwarves and Elves being the races you can pick from. 4E is starting to feel a bit like always playing a monster campaign.
That's certainly valid.
The only problem I see is that while the Essentials line seems to include the classic races, what about other traditions like Barbarians and Bards?