Pluspunten
The company mission couldn't be more relatable: help people find better jobs (economic opportunities). The same applies to employees: LinkedIn cares about employee personal and professional growth, there's training and mentoring to achieve those goals. Transparency and collaboration result in lower stress levels. Freedom to explore, tinker and innovate provide an ideal environment to grow and learn.
Minpunten
Mainly growth pains, some systems aren't up to the task for the size and complexity of the company, although changes are being made and things are getting better (for example meeting scheduling systems). Also, LinkedIn is known for spamming non-members. Unfortunately it works and there doesn't seem to be a better way to get everybody on board. There's no downside to having an account and a lot of upside (at least in my admittedly biased opinion), so I'm kind of OK with that.