Cracking machine, loved donkey kong country 1,2 and 3 and played them all for hours trying to get every last bonus medal. Loved the marios, yoshis island, ghouls & ghosts and sf2, killer instinct also got some serious hammer.
On the rpg front i nailed illusion of time, secret of mana, zelda, actraiser amongst others and my personal favourite terranigma, which i played through about three times.
I think it comes down to what they were willing to put in, back in the day when developers couldn't rely on fantastic graphics to sell a game they had to work harder on the actual gameplay, donkey kong country 2 and 3 already had state of the art graphics for their time so instead had a dearth of secret bonuses to collect and a complete new island became available if you got them all.
The snes still is a brilliant machine, hence the amount of emulators available for it, it's just been surpassed in the graphical stakes, although the step up from gamecube to wii graphically is rather insignificant IMO