I just spent a good amount of time over the last few months building a prototype for an application in Meteor and it has been a joy.
Out of the box I got happy, grokable app/server communication, I got sane user account tools and I got a build process that works well enough that I haven't thought about it at all. I almost never need to look at documentation, I just build features. I've only needed a few community packages, and the ones I have used have been working pretty well for me.
I feel like I've been living the dream. So much ceremony and overhead just melted away.
I'd be curious to hear what kind of issues people have hit with blaze/meteor package management/etc that make them want to swap in react/npm/etc. (I spent the better part of 2015 with react/flux and it would take a lot to get me to switch back).