Hassles with installing NPM packages (they used their own package manager (!)), it was incredibly heavyweight, baked in reliance on MongoDB, and a weird templat

Hassles with installing NPM packages (they used their own package manager (!)), it was incredibly heavyweight, baked in reliance on MongoDB, and a weird templating language caused a kind of death-by-a-thousand-cuts situation. Plus, React came out and blew Meteor out of the water.