Just P/E by itself does not say anything. Amazon was at around -3000 or more at some point and people were still buying it and pushing it up (this continues to happen even now, with Amazon's P/E being around 297 as of this very moment whereas Netflix is about 209). Even the P/E projections for the next two years look significantly favorable with Netflix than with Amazon.

The businesses are very different, but P/E as such is just one measure of market sentiment on a stock.