I think AMAZING ADVENTURES as well as any Marvel series manifests the changes that occurred at Marvel in the transition from the Silver Age to the Bronze Age.

Kirby was angry about being uncredited and insisted on scripting his own material in his Inhumans stories in 1-4. Issues 5-8, after Kirby's departure, are by Thomas and Adams, in a warm-up for their AVENGERS "Kree-Skrull War". The art on issue 5 in particular is exceptional, and the storyline manifests the Bronze Age trend toward more introspective, realistic and socially relevant storytelling. A few issues later, The Beast (after a beastly transformation conforming him to accommodate the early 1970's the monster craze) debuts in issues 11-17.
The series finally reaches its definitive run with issue 18, debuting Killraven in a story by Thomas and Adams. That again, was delayed roughly 2 years by Neal Adams dragging his feet on the pencils, to the point that Thomas took it away, and gave it to Howard Chaykin to complete the second half of the book. And after two issues by Conway and Wolfman, McGregor began scripting with issue 21, and the series reached its peak when joined by artist Craig Russell with issue 27.

FEAR began with its first 9 issues having Kirby and Ditko monster stories reprints. Man-Thing began appearing in issue 10, by Conway/Chaykin/Morrow. Steve Gerber took over the series and it began its definitive run in Oct/Nov 1972.

The same trajectory demonstrated in ASTONISHING TALES, that began in 1970 with unimpressive Kazar and Dr Doom stories, with occasional spots of brilliance by talents like Windsor-Smith (3-6, 10) and Neal Adams(12), and finally launching its definitive run with Moench and Buckler's Deathlok series (25-up).
And with MARVEL PREMIERE, which more quickly started off with definitive Bronze Age characters like Thomas/Kane Warlock, Englehart/Brunner Dr. Strange, and Claremont/Byrne Iron Fist. And then becoming more hit and miss, with later featured new characters.

MARVEL FEATURE is another series that followed the same pattern, introducing the Defenders, early work by Craig Russell on Ant-Man, and then Starlin's work on the last 2 issues, that became part of the canon of Starlin's classic CAPTAIN MARVEL run.

But I hadn't realized until you said it that unlike at DC, none of these on the Marvel side fully materialized right out of the starting gate, and took a few years to develop into the series they are known for. With the exception of Thomas/Smith CONAN, and Thomas/Buscema AVENGERS.

And MARVEL SPOTLIGHT that launched Werewolf By Night, Ghost Rider, Son of Satan, Moon Knight, and Spider-Woman.

And less successfully, CREATURES ON THE LOOSE ( previously TOWER OF SHADOWS in issues 1-9), which after a number of stillborn births, finally launched Man-Wolf by Kraft and Perez.
Perez's first series, before he went on to do FF, AVENGERS, INHUMANS, LOGAN'S RUN and others.

Even though not major Bronze Age talents in 1970-1971, these titles introduced many of the creators who would soon produce definitive Bronze Age work.