Eh. I'll let this review be a stand-in for all of Mark Millar's run on the "ultimate x-men" title, which he launched as the sister title to Bendis' (far superior) "Ultimate Spider-Man" title. Millar is known for his bombastic, offensive, and utterly moronic attempt to tell 'mature' (i.e. sex (PG13) and violence (Pg13)) superhero stories to appeal to teenage audiences. His ouvre is defined by this kind of shit. I sound negative, and for the most part I do dislike his work, but some of it I love.
Like this.
There was a period of time where he truly defined the Marvel Universe, and it lasted from about 2002 to 2006 (UXM #1, Ultimates, and Civil War). This was after he had jumped onto The Authority at Wildstorm, a superhero book that first took the 'government sanctioned real-world peacekeepers' angle that was definitive in the early-to-mid 2000's. He wrote some other shit here and there - a Spidey run, a Wolverine run, Ultimate FF -as well as his indie work, but really those three titles helped showcase the adaptability of many Marvel properties into filmic language and influenced the initial direction of the Marvel Cinematic Universe.
For better or worse, his storytelling instincts are forever imprinted on DNA of a decade of superhero storytelling.
"Ultimate X-Men" came about as a way of simplifying the X-Men saga after a decade of increasing convolution during the 1990's. Really, 1990's X-Men is maybe that series' apex in more ways than one. It features some of the most famous stories and the broadest cast of characters, as well as some of its most recognizable visual motifs. It's also essentially unreadable. Look, I know the series was better during the 70's and 80's, but the 90's is what the modern comics are always chasing nowadays.
So UXM starts with Millar distilling the team back to some of the core characters, mostly those seen in Singer's 2000 blockbuster + Beast, Iceman, and Colossus. Millar's version of Xavier is so much more two-faced and abominable, and his Magneto is an outright cult leader. I can go without his Xavier, but I adore his take on Magneto. Magneto is a villain who was turned antihero, like, 40 years ago at this point. Even his greatest act of villainy (at the end of Morrison's New X-men) has since been retconned to maintain the utility of ole' Mags in other X-Men stories, and he's now one of the stars of the mainline franchise.
Millar has 6 major stories. The first two are the best (one of which plays with the Weapon X stuff for Wolverine, as all X-Men stories must constantly do I guess). The 3rd is good, but features weird art shifts between Kubert & Bachalo - whom I love individually, but sort of don't think work well trading off. The 4th is shitty bullshit that doesn't go anywhere and engaged with the Phoenix stuff that no UXM writers are ever able to really figure out for the remaining 2/3rds of the series. The 5th is a crossover with The Ultimates that doesn't really go anywhere. The 6th is a "return of Magneto" story that just...sucks. Anticlimax after anticlimax.
So I love the first two arcs and will always revisit them fondly, even though Millar's primary mode is "write everyone like a asshole." The rest, eh.