Some of the criticisms of Meteor are out of date. Last year Meteor added exact code splitting, making it a cutting-edge and industry-leading JavaScript build tool. Also, the criticisms of Meteor as something that doesn't scale are out of touch with the current state of the product. Pre-2017 Meteor had difficulty scaling due to its method of oplog tailing wiht Mongo. But last year Redis-Oplog made that a thing of the past. With regard to SQL and other databases, Apollo addresses scaling concerns.
As a relevant data point, Qualia uses Meteor and recently raised $30M.