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You do not need 100% completion to find out what happens to Tidus. You only need like 80% completion for that maybe more. There are three endings. The bad ending, the good ending and the perfect ending. The first two give you FMVs, the third gives you a cutscene, on top of the FMVs. So it is best to just get the different endings. Though the important one is the good ending which is not hard to actually get. The only problem is that you have to know what to do to get the ending.
As for the game, you have to take it in the spirit it was created. It was meant to be fun, FFX had a depressing storyline, FFX-2 was meant to be cheerful and happy. While there are sad moments in FFX-2, it is not like a lot of the FF games where it is all doom and gloom. It had a battle system that was one of the most enjoyable in any game and you could do what you wanted and play as much or as little as you really wished.
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