This is a volume that really reads better as a whole, as the arc from issue #6-23 is pretty much a single story. The main problem is that the even bigger arc of the Red Skull got messed up by the Axis crossover, so this volume pretty much ends in a muddle: we don't have the Magneto issues that crossed over with the final two UA issues and then everything ends on a cliffhanger for Axis. So this volume has a lot of strengths, but those end with #23. If there was a nice paired hardcover that covered #24-25, the two Magneto issues, Axis #1-9 and any other major Axis crossovers that'd do the job ... except Axis didn't really end the story of the mutant Skull either ... Sigh.
The Red Shadow (#1-4). The concept of an Avengers/X-Men team is fun (and would be used to good effect in the years that followed), and Remender puts together a good team here, particularly with the smoldering distrust of Rogue for Wanda and the desire of Alex to prove himself. He also gives the comic a dark and weird feel that's pretty unusual for either franchise. That mostly focuses on the augmented Red Skull, who's a great villain for this comic, but who would go on for way too long over the years of multiple UA volumes and the Axis crossover. Despite all of that, this first arc is a bit "meh" It's too decompressed and too full of extended fighting. There are moments of greatness, when the characters interact with each other and in some insights into the future. But so far, the comic isn't there [3/5].
Let the Good Times Roll (#5). The official introduction of the team is a much better character piece. It's also got an entirely intriguing intro to the Apocalypse Twins and a much tighter battle (with a more shocking end) [4+/5].
The Apocalypse Twins (#6-11, 8AU). This feels very much like a continuation of Remender's X-Force, which is all for the good, as it allows him to expand upon the Apocalypse mythology that he created there. Meanwhile, it combines that with Kang's machinations to really create a Avengers/X-Men villain. Some of the characters feel a bit wooden, but Remender does a good job with Rogue, Scarlet Witch, and Havoc. All around, an enjoyable comic, albeit one that's mostly foundational: we meet the villains and their new Horsemen of Death and see the setup for their ritual ... and then it's "To Be Continued".
The preludes are also pretty intriguing. The Thor backstory (#6) is a great Thor tale that builds on the mythology of Jarnbjorn and also nicely plays with Kang's timey-wimeyness. The Ultron story (#8AU) does a great job of integrating Kang into the crossover event but otherwise is a somewhat dull fight. [4/5].
Ragnarok Now (#12-17). This is a direct continuation of The Apocalypse Twins volume, and they really should have been collected together (as is now the case in this omnibus). Of course, doing so reveals how very decompressed this arc has been. Nonetheless, it does a great job of providing great character moments for a variety of characters. Simultaneously, it tells a truly epic story, made the moreso by the very shocking issue #14. That's also the point where you increasingly realize that this story can't stand and there's going to be a big reset button at the end. That can make the story feel a bit pointless, but I feel like Remender does well by it in the ultimate volume of this story [4/5].
Avenge the Earth (#18-22). A fun and exciting ending to an innovative storyline. We all knew the big reset had to happen, but nonetheless Remender doesn't totally erase the repercussions, leaving a few lasting changes to his cast. Meanwhile, the plotline itself is tons of fun, with a great reveal of the master villain, and deep delving into Marvel continuity (although many of the future characters are largely wasted). I'm looking forward to reading what comes next, out of this.
After Earth-X (#23). This is the follow-up to the long-lived alternate reality that's taken up most of this run, and it's cool because there are repercussions. So often alternate realities are cast aside afterward and ignored, even if major things happened in that other world, but here we get something better — major character growth, mainly for two characters who lived a lifetime together. [5/5]
Axis Prelude (#24-25). This is barely an Uncanny Avengers story since only three of the team are involved. Beyond that, it doesn't have any closure because it's all a setup for Axis. So, though there's nothing specifically wrong with these issues, it feels like they should have just included them in the Axis volume as "Act 0" [3/5].
Annual. The Annual that finishes things off is horrible. I can't believe this is Remender writing, because it's got almost no plot and is entirely uninteresting. And the funny isn't. Bleh. Oh, and this doesn't fit into continuity; it seems to be years old. [1/5]
Unfortunately things went downhill from here, with Axis being bloated, dull, and banal. That also led to the character assassination of Havoc, who would be gloatingly evil for years afterward, also torpedoing any hopes of resurrecting the intriguing plot line between Wasp and Havoc. The later volumes of Uncanny Avengers were a bit mediocre, but not horrible, but even that's ended now, meaning all of the potential of this volume has now been wasted, alas.