Amazon has an employee rating of 3.5 out of 5 stars, based on 209,825 company reviews on Glassdoor which indicates that most employees have a good working experience there. The Amazon employee rating is in line with the average (within 1 standard deviation) for employers within the Informatique industry (3.9 stars).
Great company culture with lots of extremely qualified and smart people, flexible working hours (if you want to work more, you get more if you don't you don't, but you may get stuck in your position), work is interesting, and good location (Seattle).
Cons
Turnover is huge, so the people you are working with are constantly changing, so it's hard to build up a stable working relationship.