While part of the Marvel Universe, Legion is an odd-man-out, neither part of the big budget Disney cinematic universe or the Netflix version of the Marvel universe. It also has the best acting, writing and direction of any of them and a more mature approach. It's a cerebral, surreal sci-fi mutant show. If you are a comics fan, the fact of Chris Claremont & Bill Sienkiewicz involvement in this tells you almost all you need to know -- it successfully carries both of their styles onto a TV screen. Claremont wrote many of the most legendary story arcs for the X-Men. Sienkiwicz is a brilliant comic artist, emphasis on artist -- he often works with paint and mixed media to create comics that look like fine art. The writing and direction is complicated, non-linear, and accomplished, verging on avant garde. There is immense attention to detail and editing, artistically-framed scenes. The acting is a cut above other Marvel shows (although Cage gets an honorable mention) and they've gathered a cast that works great together. The psychological, Lynch-ian freaky edginess that Sienkiewicz infused in all his work is present. It's not perfect, it takes some risks that don't work (like season 2 ep.5 -- tedious and anti-climactic), but it is freaky & cool.
