From VGChartz:
PacManCE units (lifetime to date): 329,698
Galaga Legions units (lifetime to date): 43,510
"Uh. That didn't work out so great. Can we take a mulligan?"
I guess the interesting thing to ponder is whether, if publisher/MS were to give them the chance, would consumers be more or less interested in checking it out? At the very least it could be a unique marketing angle.