[lisa]

I do a lot of poly reduction for games, and automated reducers of any kind rarely give really good results. The reducer will certainly reduce the number of faces, but the computer has no way to determine which surfaces are really "important". Most reducers look for minimum angles, which preserves the overall shape, but they tend to lop off a lot of things and artist would have left. i.e. I've seen a lot of reducers cut the ears off the Stanford bunny when severely reduced. A human would have left the ears on the bunny and reduced the legs instead.

If the model wasn't authored low-poly in the first place, I'd recommend using it as a template and tracing over it rather than trying to reduce it. Tracing goes pretty quickly, and the end result will look much better.