This is ridiculous
A camera is a tool for making pictures. It's that simple. This camera makes amazing pictures for the price. And it is a serious studio tool, which no other equipment can match for the price.
It lacks seriously in some areas, and is an extremely serious tool in other areas - something it shares with cameras priced with one or several more zeroes at the end. Their reviewers are never bashed the way the OP is, though.
I am well placed to know how quirky and inefficient Sigma cameras are in some areas - I have them all, aside from my m43 and Nikon equipment.
Still, my $499 DP1 Merrill (Adorama Black Friday - 2014) has so far earned me enough in the five figures shooting studio assignments to finance my Nikon equipment and plenty of other goodies, which, for these studio conditions, can't hold a candle to my DP1m.
Which DP1m keeps shooting, and shooting, and shooting, and serving the needs I bought it to fill, flawlessly, paying for all the other gear I ever feel the need to play with.
It is a TOOL. A serious one. It is no combination wrench, it will not cover all nut sizes, but it will handle what it's made to deal with flawlessly.
No one is bashing the Leica M for not having AF, or this or that MF back for needing multipass capture on a tripod and whatnot. None of them can match even a d3100 in AF - they don't even have it
My entry ticket to just match my DP1m with CaNikon (yes, that's how mainstream is commonly called, it's not demeaning, no need to s#it a brick) will be in the $2.5k just to start.
A little respect please. The reviewed gear is a complete photographic package, able to handle serious tasks, at barely the price of a good lens alone (funnily enough - from the same brand).
Give credit where credit is due, it won't hurt anyone to get their heads out of the sand for once. One would think you're all insulted that someone has praised gear you love to despise.
The SD Quattro is a quirky, kinky mistress. If you don't like her or what she does - all the better. More fun for us. We still have our CaNikon wifes for the mainstream obligations