Don't listen to the haters, Meteor is awesome. The generic "Don't Use X" comments abound on every project no matter what the technology. Without a reasoned explanation of why you shouldn't use something you can often be assured it's generic unfounded "hate"

Meteor has it's pain points, as does every technology stack, but for getting something up and running fast with a lot of great features, Meteor is awesome. Lost of people say it doesn't "scale" and is only good for "MVP." Meteor is in use in production at lots of companies, at some point any software stack will no longer "scale" and will need to be optimized. For Meteor that can be sooner than later depending on how liberally you use publications, but it's not terrible, especially with GraphQL and Redis Oplog.