personally i find him extra bland
like a great value version of Marty Scurll who to me is the british midget that actually has charisma
but i'm not a smark so i'm not really Balor's target audience
If anything Balor appeals to a wider subset of the audience than almost anyone else on the roster. He's over with females, little kids, and neckbeards. Who else can you say that about other than Jeff Hardy? It's not many.
He's far from my favourite wrestler. I find him a little bland too. But he clearly has something, or he wouldn't be getting the reactions and moving the merch that he does. WWE had all the metrics on how he did as champ/headliner in NXT for a year and they debuted him on the main roster with the one of the strongest insta-pushes ever. I can only infer from that fact that they liked what his NXT/merch numbers were telling them.
I somehow doubt that a similar scenario would play out if Marty Scurll had been signed instead of Finn Balor. Come on breh.