LA, if you have to ask, yes. :P
Since "all of the above" was a vague answer and the fact I'm extremely bored right now, I'm going to go into detail.
First off, yes, perception is a big one. People today can't seem to be open-minded. They have strong biases and don't believe anything that goes against that. And this exists on both sides... import and domestic fans. GM is lacking.
Second, interiors. Frankly, I couldn't give a rat's ass how the materials feel. Only obsessed Californians would. If it looks good is what really matters. You want the dash to atleast look high-quality. GM still lacks here... regardless of the feel. And to cater to the biased retards, you have to bring the feel too. Oh, how it must feel to be catered to... GM is lacking.
Third, powertrain. How many OHV 6cylinders are there? 3.5, 3.9, 3.4, 3.8... ugh, Too many. There should be none. The available DOHC 6's are so much more refined. The only push-rods GM should make are V8s... They seem to have those perfected unlike the V6s. Also transmissions. Look, GM makes the best one, IMO. It is just short a gear or two. But I could care less about that. Manuals. Mainly, the availability of them. Why must I have to get either the top-of-the-line or base model to have one in a Pontiac? Hell, I can't even get one on the Grand Prix or Torrent. GM is lacking.
Fourth, design. Just look at the new Impala, the LaCrosse, the Cobalt, the G6, the Malibu, the Grand Prix, the STS, etc. Most vehicles are either A; bland B; ugly or C; watered down (aka bland v.2). First off, tell Lutz to leave his paws off great designs. Instead, let's have him start before the design. Solstice, HHR being results of this. STS, LaCrosse, and I think G6 being results of the first. GM is lacking.
There's much more... but I've know grown bored with this, too.