Anger? Not really. Only being critical to someone who always bashing people complaining about Apple products and boast about how perfect they really are. The most amazing, miraculous machine ever made on earth an all that.
But when I asked him to exchange my defective Mac with his perfect Mac and see how that goes, just like a slight turn around over the fact he would just go .. silent.
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Yes iMac is relatively and nicely quiet, but not silent. Especially when you makes a heavy load to the CPU/GPU. The fan revs up and you can obviously hear it.
So don't believe it if someone tells you "iMac is one of the quietest computers ever, period"
Having said that, it's really difficult to have an ideal experience over computer. Your iMac maybe near silent, but again your room acoustic does not. So in the end it doesn't really matter how silent your computer is, as long as it doesn't sound as jet engine, I'd be fine.