In his latest game review, The Uncanny X-Men for the NES, the Angry Video Game Nerd mentions the Sega Nomad's lack of reset button. The Nerd doesn't get angry at the Nomad (who would?) but does make a good point of how shitty it was of X-Men on the Genesis to require the player to literally reset the evil computer by quickly pressing the console's reset button. Holding the button too long would cause the game itself to rest, and playing on the Nomad meant you couldn't finish the game at all! Thats about as lame as the new Wolverine movie.
Check out the Nerd's video here, the Nomad nod comes at the 12:40 mark.