Well, lets see:
The guild disbanding is a good thing IMO because it's a chance for us to see the guild members as individuals with interests and objetctives of their own. Some of them will join other guilds, travel around the world, get "normal" jobs, marry, things like this and then reunite when things call for it becase we all know they won't be disbanded forever. It's a matter of how Mashima handles it.
I think that Doranbolt being a FT member since the start was bad an he is one of my favorite characters. One of his positive points was that he was from a different faction than the protagonists and thus had different interests. Also, revealing it felt redundant/unecesserary because the guild will disband anyway so he could continue being "the last council member" and his character could get some expansion frm there. Not counting the fact that it makes no sense for him to be a double agent if he had no memory of what his mission was.
Erza and Jellal, meh. I don't like/care about them anyway. I'm happy to see that OS joined CS though, hope they have more chances to shine now. Gray and Juvia isn't all that interesting too but I like that there was some development with them. It looks like Gray is starting to acept Juvia's feelings, maybe with this juvia will be less of a love freak and Gray will be nicer to her. I wouldn't mind if they get togeter in the timeskip.
Minerva's redemption was stupid since the start to me. She was supposed to be a great villain. Someone who could match Erza's OPness, her potential was wasted and a his father got blamed for everything she's done... That was really badly executed IMO.
Natsu is E.N.D., well I didn't liked this theory since the start but in the end it's not that bad. It can be a good way to raise some internal conflict. Expecially with Gray and even more if Natsu start to lose contol of himself.
I guess this is it. Looking forward to the timeskip. Also I'm seeing hints on the best ship sailing before any other. We all know that all that's left for Gajeel x Levy is cannon oficialization which I'm hoping wil hapen during the timeskip.