Pros
Great benefits: pension + 401k + medical/dental/vision health care at low costs. Great Learning Together Program (LTP) which will help get you advanced degrees. A lot of variety of positions available at various geographical locations. Good work/life balance as compared to other technology companies. The products that Boeing produces are vast, complex, and sometimes awe-inspiring. No where else will you get to work on satellites, space shuttle, missile defense systems, leading edge military weapons, and commercial airplanes. Some people are very bright, but some aren't. Such is the case with all large companies.
Cons
Average salaries, lower growth opportunities. International opportunities within the company are very hard to get and are normally reserved for executive level positions.