Well, I'd say only five somewhat-to-very unhappy customers out of the 40 that have responded so far is pretty good.
Regardless, I have a first-off-the-line 17", and I'm all kinds of happy with it. Nothing at all to complain about.
And if I lay my ear on the left speaker near the power input port, I suppose there is a slight buzz sound, but I've never even been able to hear it from a sitting position, regardless of how quiet the room is. I'm sure some of them are actually unpleasantly noisy, but I'd recommend not going nuts trying to find every odd little noise your MBP makes--electronics make noise--it's a fact of life. Every Windows computer I've ever used, laptop or desktop, has made varying amounts of noise, every Mac I've used has made noise of some kind if I listened hard enough.
The same can be said of my TV, my DVD player, my VCR. Heck, I've heard HP scientific calculators that make a FAR louder whine than my 17" laptop here.