Unless you have some really good friend inside the group that can vouch for the presence of sanity, just assume your new group's management is a bunch of lunatics. Subsequently, decide whether what you're getting paid and what you will (likely) learn is worth dealing with said lunatics.
A few things I've written about what Amazon is like:
https://www.quora.com/What-are-some-cultural-faux-pas-when-w...
https://www.quora.com/What-allows-Amazon-to-be-so-innovative...
One good thing I'll say about Amazon is that it's a great way to break into the "big four" tech companies. If you didn't get into Google or Facebook initially but got into Amazon you can pretty much guarantee you'll get recruiter spam from lots of top companies.
I have worked with other big names, small and mid size startups.
Amazon in itself is a sub-culture in software and technology. I would recommend anyone getting an opportunity to work here to go for it. Even if you leave after a year or two, I am sure you will learn things that will shape your career in a positive manner.
Don't know much about 'Amazon' outside of 'AWS' so can't comment on it.
With that said, if you are looking for adding a good name to your resume - why not join and see how it goes.
If you have reservations about the people or the work, don't do it. You'll burn out if your in the wrong fit.