I completely agree with the throttle complaints the original post mentioned. I went from a Tundra to a 14 Sierra and was really disappointed in how hard I have to push down the throttle to get the truck moving forward. It does feel weak until you get about 30% into the throttle. My tundra barely took any pressure and it felt a lot better. My wife has a 2012 GMC Terrain and the throttle in that is just as tight and snappy as my tundra was. I get in her v6 Terrain and feel like its quicker and more powerful than my V8 sierra. I'd say my biggest let down so far for me with the sierra is the gas pedal. I've had it for a month and I'm still not used to how much pressure it takes on it. With stop and go city driving I really hate the pedal.
I just used the AC seats yesterday for the first time and was also blown away that the exhaust vents for the ac seats blow hot air right in the face of a potential back seat passenger. I couldn't believe it. I originally thought those vents were standard hvac vents that blew air in the back. I drive by myself most of the time so it shouldn't matter much. But I can see going on a road trip with a full car and not being able to use the ac seats because any of my friends behind me would complain about having hot air blown at them when I'm pumping my AC.