There's noise evident at all iso's, regardless of which scene you use. And pretty bad in low light. But it's a point and shoot with a teeny sensor, so that's hardly surprising. And ultimately it's all relative. For what it is- a cheap camera - it's not bad.
I did say 'for blue skys, it's worth a try' not 'Always use the vivid mode'. I found (like the pic above for example, which doesn't look overly noisy at that size) that I like the image to have a bit more of punch, and if that comes at the price of an increase in noise then so be it.
Like I said, if I want to take anything more that a snap-shot I use something else. Because as far as I'm aware there's no magic tool for getting rid of noise.
But it does a job and is very versatile, and on the whole I'm very pleased with it.... I can tell you're pretty attached to yours.
EDIT - Just read your link. Proves my point about the noise.