It is highly encouraging to me that Meteor is acknowledging the larger trends in the Javascript ecosystem and promoting React to an officical frontend layer instead of doubling down on their homegrown solution. Likewise for seamless Babel integration and planning the move to official ES6 modules. Buying into a full-stack solution like Meteor is a scary proposition; you're giving up a large amount of control for a pro…
I just like the sticking with general modularity approach (that really reminds me of Ruby).
I don't think the Meteor proposition is any scarier than getting into Rails, Django, or even Laravel. You're basically trusting a growing ecosystem that will prevent you from re-inventing the wheel.