Sometimes I get surveys from Google about how much I like App Engine. I'm always hesitant about marking them too poorly out of fear that they'll decide to shut it down if the results come back too bad. They need a question along the lines of "would you rather that we fixed the issues preventing App Engine from being an amazing, awesome PAAS solution, or shut it down?" question.
Ultimately, I do love App Engine. It's just the really poor support from Google that is letting down what could be an awesome platform. Neglected bugs, outdated docs, key limitations (eg. no https on naked domains, which looks like it will hopefully be fixed soon) and such.