Splatterhouse isn't overrated. If it were widely released in America on other systems (the better versions of it, that is) then one could make the argument but in the US it's only in one place. In fact the system exclusives make this system. The ports seen on other US systems are essentially trash, with few exceptions (Cadash, maybe that's it really).
Splatterhouse is a fine game, don't get me wrong. I just wouldn't consider it one of the best on the system. Take away the atmosphere of the game and basically you have Vigilante. Which is also a fine game, but not one of the best on the system.
I can't fathom anyone voting for space harrier or hit the ice above. It's like a vote for the green party or the libertarian party.
You either know me in real life, or stumbled across a message perfectly crafted to troll me.
I voted for Space Harrier
and I lean heavily libertarian.
EDIT: WTF, Splatterhouse has more votes than Air Zonk.