Don't believe the negative reviews of senior leadership
Pros
This is a well run company that seeks to make good decisions about it's operations (internal), investments in research, and how best to meet objectives of making the world, not just the US, more secure. Mostly they get it right. They make science-based decisions on things like masks and vaccines , which suit me fine. Work/life balance is great. Opportunities to have a significant impact on national security and helping the government be more effective are everywhere.
Cons
Given the number of employees spread out all over the world (but concentrated at DC and Boston sites), and the different types of jobs including some that don't require a strong foundation of science, there would be some grumbling about poor leadership. Clearly most well-educated people in our current national situation prefer a more liberal or a traditional conservative agenda than one based on fascism, Russian propaganda and criminality but not everyone. Even within MITRE unfortunately.