Good:
Secret of Mana: Whoa! How much good! Staying at the top of a floating fortress combating the huge Mana Beast with the mytical Mana Sword and the Mana Magic reaching the maximum level. The best point is that you feel that the part of the game that stay before this moment is USEFUL (yes, level power ups, items carried, etc...). Is my forever fav game.
Illusion of Gaia: The ending boss is pathetically easy, the ending movie is great with a simbolical movie but the previous thing (this is: THE GAME) is quite boring.
Bad:
Terranigma: The plot of an underworld is amaizing, the idea of a huge conspiration too... The final boss is quite stupid (in apperance, the difficult is ok) but the ending movie... Ehem... What a carp!
Secret of Evermore: Ehem, a game with amaizing graphics and music (specially sounds) but the plot is pathetic. The Great Enemy is a stupid robot that doesn't move (just bounce from a side to the other side) and it happens in a... claustrophobic room withouut any graphical interest. You start killing some loudspeakers (??) and ventilators (!!)... After some recycled enemies (this is: an enemy or ally graphic with some colors changed) and finally the crappy white robot. And the ending... A typical "everything is starting to collapse, we must go out!".