Websters defines Jellal as: overhyped and underdelivered.
Really, is there any real reason why this guy gets so much play outside of the fact that Mashima is shipping him and Erza so hard it seems almost like an act of desperation. We don't need to see a low-impact character show up every single arc. He hasn't delivered since he was owned by Natsu. And his Eldoras counter-part Mystgun was almost as lackluster as him.
Here is the thing, less Jellal and more Gray. I'm tired of seeing Gray passed over every single arc outside of the one arc that was devoted to him and Leon. Gray is far more interesting and relevant to the story. Not only that, but Gray is actually vital to the events that are taking place. He's more than a desperate attempt to ship two characters together. That's all I got to say about that. The other characters in FT have so much potential that really, if we separate random, baseless, fandom from facts we see that Jellal is little more than fluff.