Yeah I must say I'm not thrilled with the mustache template engine.
-mouser
I've used Handlebars before. My mustache got shaved as I actually chose to keep things as simple as possible for this multi-site web engine given it leans toward being more complex than others (by being network-oriented to allow our users to keep the same login on all present and future sites).
A view/template language may an overkill when you can basically re-use what you already know in your target language of choice.
When I was doing PHP I liked smarty templates. But as things got simpler by using JavaScript on both the front-end and back-end, using as much of a single/same app language as possible to avoid "language zoo" kind of grows on you... (for the most part --I guess! Certainly there are/will be most-valid use-cases
)