Back in the day I read all the issues of this series when they were originally released. I was a devoted reader and fan, and I never quite got why so few others of this ilk seemed to exist for a writer of Chris Claremont's pedigree, making his DC debut. Reading this collection more than twenty years later, I might. It has nothing to do with Claremont, but the art of Dwayne Turner.
Turner's work seems to have been inspired by the Image style, back when Image was still the newest and coolest kid on the block (and, incidentally, still known for superhero comics). DC launched Sovereign Seven at around the same time as its "zero month" launches following Zero Hour, which among other titles included Manhunter, a new version of a classic character with art that also aped the Image style. (That same "zero month" also included Starman, meanwhile, so clearly there was plenty of wiggle room.) Anyway, Turner's work is tough to appreciate now. It's the polar opposite of Jeff Johnson's. Johnson draws a "year one" origin story (from Sovereign Seven Annual #1), which is also Claremont's best script in the collection, his most focused and dynamic and fun. If the resulting series (Ron Lim eventually replaced Turner on art, and that was a definite improvement, anyway) had been like that, I would have no question at all why the fans rejected the comics (fans being fans, basically, which paradoxically means hating as much as loving the things they follow). But the fans, this time, were probably justified, if they bailed based on early results.
Again, it's not the concept or the characters, but the execution. Claremont dove into storytelling that, alongside Turner's art, stripped all the appeal away. He was too busy diving into the deep end to consider whether or not the material was serving the setup. Perhaps the biggest mistake was dropping the characters into Crossroads, a mystical tavern that had nothing to do with the origin story or adequately positioned the team as bona fide superheroes. If Claremont made his name writing the X-Men as constantly pressed up against expectations, he miscalculated when he inserted similar restrictions when they weren't the least warranted, justified, or necessary.
(Then again, maybe the mystery of Crossroads was one mystery too many, alongside the simmering secrets behind Finale, not the lead but positioned to be the most intriguing member of the team.)
Being creator-owned, Sovereign Seven won't happen again unless Claremont desires it. Maybe someday he will. Maybe he'll let another writer play in the sandbox, and reclaim the potential. With more consistently complementary art.