The Avengers are currently careening through Marvel's famous multiverse - but their continued adventures only exacerbate a massive problem with the comics. Long-time writer Jason Aaron has spent the past year setting up a major confrontation between Earth's Mightiest Heroes and the infinite Mephistos of the Multiverse, who seek to eventually dominate all existence in a grand multiverse war. Unfortunately, Marvel's many multiversal Mephistos are more meandering than menacing.
In 2021's Heroes Reborn event, the Marvel Universe was flipped upside-down when a pact between Agent Coulson and Mephisto resulted in a dystopian world in which the Avengers never formed. Thor never found his hammer, Captain America remained frozen in ice, Tony Stark was never captured - and as a result, the Squadron Supreme take the place of the Avengers in the universe. Eventually, Blade reunited the Avengers and restored order to the world - but Mephisto revealed the Heroes Reborn universe was only a test run of his true plan: to use an infinite number of Mephistos to take over all realities instead of just one.
The current Avengers are well-aware of Mephisto's desires, and so the team journeys from one universe to the next to recruit the many variants needed to stop him. This is where the trouble begins: Jason Aaron has elected to spend the past four issues chronicling the adventures of variants whom the reader has never met, nor will meet again once the event is concluded. A Jane Foster variant who is tricked into living in a WandaVision-esque domestic illusion with Thor, a Captain America variant with the magic of Doctor Strange who lives in an alternate World War II, and a Ghost Rider living in Feudal Japan are just some of the variants encountered by the Avengers.
Unfortunately, far more focus is given to these one-off characters than the core group of heroes; the Avengers are essentially guest-starring in their own story. Additionally, the main plot - Mephisto's takeover of all reality - grinds to a halt every time a new variant is introduced. This is not an isolated issue; the recent Avengers Forever series is also laser-focused on variants at the expense of the main heroes, and while the individual issues are interesting, they rarely further the main narrative.
Perhaps Aaron is waiting until the other books are ready to cross over with the main Avengers story - but if that is truly the case, then the Marvel Universe is too interconnected for its own good. This issue is also present in the MCU; the fact that one must keep track of multiple film franchises at once all while the main story doesn't progress is a common complaint among audiences. The Avengers deserve to be at the forefront of their own book, not sidelined by one-off Avenger variants of themselves; the core team that has existed and expanded upon since 1963 is interesting enough.