Sorry to break it to you, but when comparing the iPad 2 screen to the 3, it does have a **** screen, and it is exactly like looking through a window screen. Standing alone, the iPad has a fine screen, and is serviceable for what it needs to do. If there were no iPad 3, then the iPad 2 would be the thing to get. But if I put my old 2 and my new iPad side-by-side, and I had to choose which one I'd rather look at, the new one will always win out, every time.
But if the screen on the 2 is acceptable to you, then it's your money and your choice. So you saved $200 and claim to not be able to tell the difference between a non retina and retina display. Good for you! Enjoy your iPad.
At the same time, those who do spend the money on the screen feel that it's important to them. That's their money, their choice. I spent the extra money, and to me it's worth it. I'm enjoying my iPad 3 in a way I was not enjoying my iPad 2. Considering that my iPad gets heavy use, every day, even to write this post, means to to me, that was money well spent.
I am railing against people who say it's stupid to pay extra cash for a high res screen, and that there's no difference between the two. The former is subjective and based on opinion, and if I can see the difference even with my heavy astigmatism, then I submit you'd have to be legally blind to assert the latter.