I think the characters and presentation generally fail the story. For the main story you have some pretty dull characters who never seem to have properly emoted faces with what they are saying, and on the side story you don't have voice acting at all which can leave what should be extremely heart wrenching moments falling flat, not to mention that it's difficult to get emotional about characters you were literally just introduced to.
If I ignore presentation then both the main story and side quests are fairly interesting, but as it stands it detracts too much for me to really care about either.
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