Batman.js is production-ready: our company has two production apps and I work full-time on a Rails/Batman.js app. I think the biggest weakness is the low "googleability". Even when shopify was maintaining it, the hype machine never got rolling . I've been adding docs & guides as much as I can, but there's still a lot to be desired.

I've recently been working on a glorified FAQ that would be very helpful if you decide to go the batman.js route: https://www.softcover.io/read/b5c051f3/batmanjs_mvc_cookbook

And I'd love to add to it -- just drop by #batmanjs on freenode! (ps, I kept trying to vote but I didn't see the thing go up ... and I even made a HN account just for the occasion!)