Of course, it is an unfair comparison with Moth3r, as I was playing back on NTSC (though I looked at the Doctor M conversion, too). I believe Moth3r may be able to better the quality of the PAL GOUT (if they are indeed upscaled from NTSC), working from the PAL THX LDs.
But for those in NTSC land, the GOUT are, IMHO, the best out there right now.