Also had to use passportjs lately. Meteor is so easy and natural in terms of accounts that at some point you forget, that there’s a reality where things aren’t so pretty. Though, while passport.js is totally fine for me, I find it really obnoxious, having to work on features, provided in meteor as default. On my first days working with typical express app, I’ve located 14 vulnerabilities, quite critical… while easy to fix. The only reason they appeared is because devs. had no intention to waste time on boring thing and eventually forgot about bugs.
Meteor gives the entire picture at glance, making it far harder to forget simple, but important things.