Company perception counts for something (at least for me)

So there were good things to see in $Amazon(AMZN.US)$ 's report and some potentially concerning things. But how should they affect a long-term investor's decision-making regarding the stock? Sometimes an investment decision can be influenced by past investment decisions or things we see in daily life.
Years ago (and many investing decisions ago), I sold my $Netflix(NFLX.US)$ shares after a down quarter. At the time they were worth $83 per share. Last fall, Netflix was trading around $700 (although it's now around $204 a share), but I had never gotten back in. Lesson learned: If you're a long-term investor, think long-term and don't pull the sell trigger because of one weak quarter.