I see many features that would traditionally be better modeled with a relational db. Could you share some of your successes or difficulty with using MongoDB? Its the number one thing that turns me off from Meteor every time. Manually managing your joins seems like a real pain, especially considering how easy other frameworks like rails make it out of the box.
Made completely in MeteorJS and with 10k users in the waiting list, Boutline caters to sports fans and drives sport conversations. You can follow teams, meet other fans and share moments with them. Would love to get your feedback on the product.