What do you mean what they were supposed to be? Like going back to being silly? It was never stated that that was going to happen. They're more serious and more competent now, but why is that a bad thing. It's not like they haven't got their personalities anymore. People sometimes exaggerate how they act now, talking like they're robots. I think it's pretty obvious that they still have personalities, sure they may not be as in your face as they once were, but they're still there. I can see bits where Meowth acts sort of like he did in DP and earlier seasons and Jessie and James still show that they care about him, if they were mindless drones they would just forget about him, I think.
And every now and then they go into their disguises and act less serious, so I think that still shows that they can be half serious and half silly.
I kind of hope that picture is from this episode.