In regard to the issue with the face buttons. I just got done with replays of both 2 and 3 on the PS3. I thought the buttons might be an issue but, for the most part they weren't. For weapons like the AK and Patriot I was able to lightly press square to aim and push harder to fire. This wasn't an issue at all for 3, but seemed to have some accidental firings on 2.
Also someone was wondering about price. I believe Amazon has it for 50 bucks (US).
Since, I own both 2 and 3 I'm going to pass for now. Nice as it would be to play in HD and try Peace Walker, I can't justify 50 bucks for it. Certainly when we see a price drop though.