The only thing jailbreakers really need to worry about is updating firmware. This is the same rule for PSP and Wii hackers. Don't update firmwares unless you HAVE TO.
What impress(shocks) me more is that Apple deletes all negative feedback on their forums. And I'm not talking about PC Fanboys bragging there, I'm talking about normal people posting about Apple stuff not working, not being serviceable, doing weird stuff after repairs and so on. You can't even complain on how faulty their stuff are! That's pure censorship.