1) I've used both Mac & PC Laptops for years. For some reason Apple has lagged behind the industry for a long time. One of the reasons I bought a new 15" 2010 because they _finally_ claimed to offer hi-res. I was greatly disappointed (yet not surprised) to find as usual, Apple mislead us, offering only a medium resolution. It's my only major complaint with Apple, they make up stories and claims of superiority to suit them. They cannot be trusted to deliver what they say they do.
Apple is highly successful in misleading the public, without ever being held accountable. That's what master marketing and windfall profits do. They give Apple a pass, just like Michael Vick essentially got off scott free for his vicious and criminal enterprise.
2) if you're quite old with poor vision the standard low resolution display is fine. Apple uses it because it's cheap and enhances their per unit profit. They are the only laptop maker I'm aware of that does not offer what the industry defines as a hi resolution display. They are too expensive for Apples profit matrix.
3) depending on your usage patterns the lack of a true hi-res display could be a huge problem.
Finally since I've been honest and shared my years of laptop experience, prepare to watch this post be assaulted by the Apple followers who are hyper sensitive to any post that fails to praise Apple and hide their shortcomings. This is an Apple forum, just like other Apple forums, it's an entirely different standard. Apple is a religion not to be questioned.
Cheers