I was very impressed with Meteor, but it is very new and isn't really bringing anything of substance to the table yet. Everything (other than client-side database interaction, which I am confused about who would want), that they spotlighted can be duplicated easily with backbone, node, and socket.io...right now. Moreover, backbone, in particular, is clearly a tool, like a screwdriver, that does a few things well and gets out of your way, whereas Meteor, like rails used to be, is more like an electronic lockpick...awesome magic for the limited scope of applicability, but not currently useful for most of the things you want to do in real life.