Its just the games you are playing and the artwork that was used to make the machine. Some use better artwork than others, it all depends on what was available at the time the author made the game. (usually poor quality flyers)
If you play the newer games (MFME 10.1a) you may struggle if you are using a res of 900 (I take it you have a widescreen monitior) ...... as they are usually 1280x1024 -- so some of the bottom of the screen may be missing
thanks mate do you have a link on this forum to download some of the newest games and which emulater do i open them with i only read the tutorial an hour ago so bare with me lol!