I'm int he same boat: tried the first book, just not for me. Respect that Dinniman is living his best life and thst it is making people happy, just doesn't scratch the itch for me.
But to bring it back to GenCon, the whole setup feels like some sort of absurd 1970s tournament set up by Gary Gygax, so I can really see the game as a great convention one shot. Daggerheart, to keep this on topic somewhat, feels like a great long term campaign setup, so I'm not sure it would be where I would go for a convention choice.