"Meets Expectations" ranges from 3.0 to 3.4, and employees in this range have no idea where in that interval they landed, even the career effects of the numbers are dramatically different. 3.4 is above average, while 3.0 is fatal to transfer and promotion, even years later, but unlikely to get someone actually fired. There are several managers who've been caught using 3.0-3.1 to keep people captive but unaware of the fact that they've been internally blacklisted. It's disgusting but it happens.
Whoever came up with the "innovation" of making review history part of a transfer packet (and that has nothing to do with Google; it pre-dates it) is a domestic terrorist and should get the same treatment that all the other terrorists get. It's a horrible system that eats companies from the inside. Enron's cultural decline (leading in macroscopic ethical lapses and bankruptcy) has been established to be a direct result of its globally-visible, mobility-destroying review system.
Google's Perf is a play-for-play copy of Enron's PRC, but Google probably won't go the way of Enron for extrinsic reasons. A lot of Enron employees had nowhere to go (for geographical and specialty reasons) and had to make ethical compromises to beat PRC, whereas a lot Googlers leave for greener pastures when that happens.