What exactly do you mean? Yes, a 4:3 resolution stretched to widescreen will definitely make everything too wide. But 16:9 being too thin? Maybe a little thin if you have a 16:10 monitor.

For games that don't support your exact aspect ratio, the right thing to do is to play them with black bars on the relevant sides.

Yeah, with 16:9 resolutions make the people in my games look like they came from Mars. Very tall and thin.