I'd say vastly underrated, except it's 'no' rated
Muscle is even better than its predecessor Part 3: Coping with Insignificance, riding the fine line between playful side project and full-on new wave rockfest. Keyboards and crunchy guitar feature very heavily, to the point that a Madonna lovin' friend of mine, after listening to 5 or 6 tracks off of Muscle, remarked that she was starting to feel nauseous. I don't know about that, but I do know that every song is an experiment in modulation that makes for a series of catchy, eery and occasionally video game-worthy riffs. This bounces well off of Muscle's album length homage to hotrods and bygone youth, creating a sort of Technicolor concept album that occasionally catches you off guard with just how beautiful it can sound when it wants to. All of that aside, though, Muscle is just an album that rocks by Adventures of Jet, a completely underrated band. Highly recommended.