Do we know his attack animation? >.>? Maybe it syncs perfect with Yun? I don't know... we've said not pulling or X is bad before, and a day later go crazy for... I'm not seeing what makes him bad... enlighten me?
According to several people on Reddit (can't be bothered to source, but probably in the Should You Pull thread) their frames are far enough apart that chaining Yun and Fohlen is not possible, or you need someone else to maintain the chain, or something.
I think the problem is not necessarily that Fohlen is bad as much that what he does, three previous units (Orlandeau, Fryevia, Aileen) and a multitude of future units (Tidus and Veritas of the Dark, most immediately) do better. He also doesn't have any immediately useful support abilities like Orlandeau & Fryevia (ATK/MAG, ATK breaks), Aileen (MP regen), Tidus (party buffs, MP regen), etc.. He's more of a weird evasion-based off-tank. I actually can see him potentially being pretty fun with the right TMs.
Possibly more relevant is the fact that everyone is anticipating some sort of anniversary-based insanity and so we're sitting on our lapis and tickets for that. Well, other people probably are. I spent 15 tickets to get Amelia. But you know what I mean.