see gametrailers/screwattacks top 20 SNES games on the top 10 lists.
Lots of good recommendations there.

Castlevania IV has not been mentioned. And if your in for a challenge Super Ghouls and Ghosts.

If you can find orge tactics def pick up

Megaman X, X2 (also X3 but i think it's better on other platforms)
Street Fighter II (you'll have to choose between World Warrior, Turbo or Super, or all 3 like some friends)
Mortal Kombat II, III (MK1 i prefer it on Megadrive)
Star Fox
TMNT IV: Turtles in Time
Final Fantasy IV, VI (here known as II and III if i'm not wrong)
Killer Instinct
Terranigma
Breath of Fire
The Death and Return of Superman (Don't worry, it's not like Superman 64)
Tiny Toon Adventures: Buster Busts Loose
Super Double Dragon
Zombies Ate my Neighbors

@anarchyz
Zomg Tiny toons adventures: buster busts loose great game and zombies ate my neighbors

thank u guys..o and i forgot i do have mario allstars and i had TMNT: Turltes in time but i gave it to my cuz when he was like 8...bad move cause that was a great game.

which street fighter is the best and rarest?