The curves on the Century single line font don't have the resolution on the curves that the other single line fonts.
That's because they are made up of vectors. Like Martin said, they don't have resolution. A vector only has direction and length. A bitmap has resolution. All fonts have a certain style. Century's style is as you see it--with short, straight vectors making up the curves. The nice thing about vectors is, since they ARE vectors, you can enlarge without loss of what you call resolution.
If these don't meet your needs just add different ones. Try looking at the other software fonts. Below is an example of CamBam_Stick_2 done at 3" height.