I can only say as someone who has read volume 1 vs it's equivalent episodes, but they sucked out the humour that was prevalent in the first bunch of chapters, they've rejigged where backstories are being told, so you end up not giving a damn about what's happening to who and why and end up being confused at certain characters motivations as a result, the only thing the anime has going for it at the moment is the fighting parts, which only episode 13 had enough of to cover all the cracks elsewhere.