This is probably their most progressive album of their entire catalog. Its the first one with the phenomenal Mark Zonder behind the drum kit... its the second one with vocalist Ray Alder and he has improved considerably since "No Exit". This is also a notable album because it was really the last one written with full band participation and not just "The Jim Matheos Experience".
Fates Warning was one of the major pioneers of progressive metal, and Perfect Symmetry showcases them exposing their style. Why is this a 4? While it's an enjoyable album, I wouldn't say it's one I'd revisit often. The vocals feel out of place at times, the guitar leads sometimes feel too technical, and the lyrics are a bit too abstract for my liking. Nevertheless, this is worth your time if you're a fan of the subgenre.