I played both games within a year of each other for the first time and I have to say that RE4(Wii Edition at any rate) is the overall better game for single person play than RE5. RE5 can be INCREDIBLY entertaining when playing with a friend offline or online. I just don't feel either games are worth a 9 though due to their tank controls and other gameplay designs that are counter-intuitive. RE4 may have been a revolution in '05 but in 09/10 it's archaic.
Pixel Art can be fun.