So far, the worst ending I have seen is FFIV. I was going to level to the max level in IV because I couldn't even beat the final boss at level 79, I ended up using a gameshark. When I saw the ending I was thinking, "I was going to level up to 99 for this?!"
I thought IX and VII had really good endings, two of the best. For the majority of them I thought it was well worth the effort to beat the game. Also, I think there was a huge jump in the quality of the endings between IV and VII, but I haven't played V and VI.
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