Can you compare it to any of the other places you've worked to give some perspective to your comparison? Like "isn't much culture" compared to working at IBM or "isn't much culture" compared to Google/Zappos/RedGate?
It's a big company though - my experience at other large corporations was that this sort of thing varies wildly from team to team.
The only other "culture" at Amazon was the constant cult-like references to a set of principles - people would actually talk about "bias for action", "frugality" and whatever in their normal daily conversations. It was kind of strange.
Happy to be working elsewhere now.
That said, different teams at Amazon were SUPER different. Some teams went out drinking together twice a week, some teams were super extraverted and into video games, but many other teams were a bunch of quiet, serious introverts. TEAM fit was super important. This of course absolutely sucks for you if you get roped into interviewing for one team and you're a much better culture fit for a different team. Too bad. Rejected.
IBM has a culture, it's just a boring culture. Pretty much a bad IBM culture fit is a person who's passionate about something in life. I'm sure there are parts of IBM that are different (it's huge), but I was just glad that I didn't have to wear a suit.
Google-like companies are pretty much the opposite of IBM. If you don't have some weird interest you're passionate about, you kind of stick out.
I had to pick out this quote because it's hilarious. :)
At Amazon, you don't get any of that. It is a very dry culture. It's clear that everybody is a coworker first. Eccentricity is largely looked down on (after all you need to worry about reviews and promotions, etc). Instead you get a sort of blah corporate culture, everything is grey, you talk about frugality as if somehow that's great. Rarely do you find super motivated engineers. Most people are fairly jaded, and aren't that committed to the success of projects. It's just a 9 to 5.