I'll admit I'm not a fan of big vehicles, but ultimately the consumption and CO² emissions level are deciding factors for me regardless of size or horsepower of the vehicle in question. I've set a maximum of 7,2 l/100km combined, 6 l/100km extra-urban, and 160 g/km CO² based on the ECE cycle effective since 2011 for any car purchase. It's a red line....if a car is in a larger class, it doesn't matter, it still has to meet that target to be considered for purchase.
Similarly, if a smaller vehicle meets the same critera, I don't care so much. For example, sure a Golf TDI is much more efficient than a GTI, but I don't really penalise the GTI/care because it does hit that target even if it's petrol.