IMHO, the original set of games is already great. But with this extra added, it makes the deal FANTASTIC! Basically, I can guarantee the awesomeness of Braid but I never play Super Meat Boy, and Lone Survivor before. Still, for those that already bought the bundle these extra purely an icing on the cake.
But for those have not bought the bundle, you can still get this extra games by beating the average. Enjoy gaming (responsibly).