well honestly somehow i am sad with the bad developments given to us. i also personally think that he's more capable than this.i wont argue with your point since i also reached the point where i got very disappointed.
you see, with the direction of the story before the final battle, even i,who's not a mangaka, saw a lot of good developments that uses many things which he left in the shadows.i even thought that nagi or arika is in the demon plane, and there's a way to it in istanbul. well too late since he went the other way round.lol
though since there's a lot of fantastic materials still available, (im hoping that the royal magic,zazie,and arika is included in that) and the fact that akamatsu sensei is a great mangaka, he'll make this manga great again, since he took "the road less travelled".^^ as eva sama said, go forward even when smeared with mud. lol i hope he's telling us that "hey, i can pull the best ending possible even if the manga itself hit it's low". so till the end i'll continue reading it,whether it ends bad or not.ill put my faith in him.^^.lol