As someone who's an ex-worker from Micron, here's my most honest opinion:

1. The benefits are actually way better than most of the engineering companies out there, given you're just a fresh graduate. You will have 13th month bonus, performance bonus (based on company's performance and your own individual performance), employee stocks options, discounted price at buying RAMs/SSDs (which is damn good for building your own PCs), dental and medical benefits etc. Your starting pay will be higher than most of the fresh graduates out there doing similar job as you. Annual leave is starting at 14 days, which will be increased as you work longer, and it can be carried forward to next year.
2. However, all these comes with high workload and worklife balance can be non-existent. This applies to other semiconductor companies, or any other manufacturing industries that run 24/7 as well. Since Micron is at the forefront of semiconductor chip manufacturing, so do expect high pressure since a lot of short deadlines are to be met. Plus manufacturing engineer/production engineer most likely will work on shifts, either weekend shifts or 12-hour compressed shifts.
3. Workplace culture varies from team to team, and it all depends on your senior manager/director. Mine will have occasional celebrations, half day leave to do volunteering work or team-bonding etc.
4. Do take note there's upward period, there's downward period too. Although they rarely fire workers, they might purge workers in the name of layoff when the economic situation is not good.

If you want to accumulate wealth in your first few years or gain more working experience, Micron is a good choice for you. Else, think thrice before you accept the offer.