It's not. For some reason, yrwei is obsessed with this issue (see his posts in other threads). For those who are concerned about it, if you look at the CR numbers, Subaru has drastically improved this issue in the past few years.
The percentage of owners reporting oil burning, by year:
{Forester}
'10 - 4%
'11 - 8%
'12 - 5%
'13 - 4%
'14 - 2%
{Outback, 6-cylinder}
2010 - 14%
2011 - 17%
2012 - 13%
2013 - 3%
2014 - 2%
{Legacy, 6-cylinder}
'10 - 19%
'11 - 15%
'12 - 13%
'13 - 2%
'14 - 0%
See a trend?
It depends on how you interpret it. The trend could be that excessive oil consumption is a thing of the past, or that excessive oil consumption comes with increasing mileage. Without more data, it's inconclusive.
Burning a quart between oil changes is of little consequence to most owners, I'm sure.
There's no doubt that many other small and large SUVs can out-accelerate the 2.5 litre CX-5. In 2010 I traded in my Volvo turbo for a Mazda 3 hatch after driving a few Mazda 3s as rental cars. Of course, the Volvo turbo out-accelerates the Mazda 3, but in everyday driving, I found I seldom needed to put my foot into the Volvo, and probably 99% of the time, the extra power of the turbo remained untapped. Add that the Mazda 3 averaged just under 10 litres per 100 km, while the Volvo burned 13.3 and all premium.
I find that the CX-5 feels about as peppy as my 2010 Mazda 3 2.5 and actually uses slightly less fuel despite being a bigger, heavier and roomier vehicle. Personally, I don't want to pay for additional horsepower, especially since it comes with higher fuel consumption and a greater contribution to greenhouse gases.
To each his own, of course, but I find that sometimes people pay for a "bigger number" when it makes no functional difference (e.g. megapixels in cameras) or for status reasons. My work sometimes involves helping companies increase their "brand equity" - meaning that they want to be able to charge more for the same products because their "brand" adds intangible value because people believe it's better. I don't want to pay a cent for brand equity - I know you get nothing but status for the money, and I'm not interested in having status because of what I wear, drive or drink.
The CX-5 fits me very well for all these reasons. I hope others find the car that fits them best.