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Penny Arcade sums up the Unity debacle in the first panel.
(www.penny-arcade.com)
Today's Penny Arcade is a near perfect commentary on the Unity debacle.
Whole comic linked above, but here's the one-panel that is perfect.
I would actually highly recommend the [World, Star, Citie]s Without Number systems. They've been going for about ten years, and while the individual systems themselves are genre-centric (fantasy, sci-fi, and cyberpunk respectively), they're all inter-compatible and offer a good midpoint between crunchy systems and rules-light.
Also, I think Savage Worlds is setting agnostic and a little bit crunchier than most rules-light systems, but I have little experience with it.
I did have good experiences with Savage Worlds. It's system is a little strange, but it manages to be simple while still offering a good variety of mechanics for different themes, though it isn't itself narratively-oriented if that's what the group wants.