What are your computer specs? It sounds like you are getting varying frame rates. If you aren't getting a consistent 50_60 fps on all games that would explain a lot of your problems.
I'm glad to hear that the resolution doesn't seem to be as bad as the mixed reviews are saying. I keep getting ups and downs when ever I see a complaint on it.
Would you mind posting your computer specs? I too have heard that a steady 60 frames can make a world of difference.