Technically speaking, Meteor's in the best state it's ever been: latest Node version, full Babel support (zero config), great accounts system, full NPM support, ready-to-go MongoDB support and access to multiple DBs via Apollo. Things like Atmosphere, Meteor's package system—which have been earmarked to be phased out in favor of NPM—get Meteor some negative press.
It's a shame, too, because having actively explored alternatives over the last six months, the only platform that came close to being comparable (in respect to being fully featured out of the box) has been Firebase. It's not the only option but it's a damn good one.
Meteor deserves far more attention that it receives—miscommunication around 2015 regarding Meteor's choice of UI framework and the Meteor Development Group's shift to focus on Apollo put a serious ding in its trajectory. A guess: MDG had to make a return for investors and Meteor itself—and their hosting product, Galaxy—wasn't growing quickly enough (just a guess).