-Entitlement. After you've worked here for a while, it's easy to get entitled. I'd say 95% of employees keep their feet on the ground and appreciative and gracious about the benefits they receive, but the entitlement plus the company's culture of open feedback ("feedback is a gift") occasionally breeds inane complaints in internal communication groups.
-That commute. If you live in SF, you'll have to hike down to Menlo Park, and depending upon where you're coming from and how bad traffic is that day, it could be as bad as 2 hours each day. The good news: that's rare, and company-provided transportation options (shuttles with WiFi) make this as easy as possible. You do get used to it, and your time on the shuttle is your own. Sure, you can do work, but you can also nap, watch Netflix, or read.