genesis is good dont get me wrong. but to be set with only one system i would definatly go with NES before genesis. but it still stands tall as one of the better of systems on all time.
lesser known arcade greats for me are
dream shopper...super awesome and highly addictive!!!
lepracaun.... real quik to pick up and hard to quit!
my super fav game hooked for life is the great DO RUN RUN!
i own a mario arcade game and its harder and has a few differences in item location. too many to list here but you'd notice when it came to hitting the coins blocks