I got this game on the Friday it was released and over the weekend I'd 100%-ed it with one of the classes. That's when the big flaw with the game kicks in. There is no replay value whatsoever. Yes, you can replay the game by creating another save file with one of the other characters but if you've invested time creating a specific character, building their skills and stats you can't do anything with them after you've finished the game except go online and basically be muscle for hire to help out the lower-levelled players.
In short, here's a list of things that are wrong with the game: low level cap (30), no boss respawns (without creating a new character or going online to find someone who hasn't completed the game yet), no quest replay (without creating a new character or going online to find someone who hasn't completed the game yet), no real class-specific storyline, no new game+/story repeat (without creating a new character), no increased difficulty or XP for anything after you've completed the game so one hit kills and 1 XP from most enemies all round and if you do all the side quests as they become available you level up too much and the storyline then becomes way too easy.
The worst of it is, this IS a good game and one that is needed on the 3DS with the online play and the voice chat. It's just a shame that the developers have completely missed the point on what makes this genre so special.