I can agree on backtracking complaint. But Vesperia is just boring when compared with Abyss, who actually remember Vesperia's story? I never see it mentioned, Vesperia has an exceptional main character, I agree with this, but it's not even in the same league as Abyss, for me that is.
It's okay to disagree. I preferred Vesperia to Abyss in nearly every way (although Fields of Fonons added a bit to the co-op, seeting up fields for each other) and it's definitely more memorable for me but it's okay if you thought otherwise.