Yep, I love Fiesta and saw him conduct a live program with SBYOV of Tchaikovsky 4 and "Santa Cruz de Pacairigua". I think there's a combo of factors here - the Venezuelan music resonated more with the whole orchestra (not just the conductor) since it comes from a tradition they knew growing up rather than one they had to learn. Also, it's less familiar - we don't know what, say, Bernstein or Munch or Martinon would have sounded like conducting this music, so we accept the Dude as authoritative.
The Dude's approach to core rep seems, like Nezet-Seguin's, to be better suited for seeing live than hearing on disc: lots of integrity and solidity so that you can nod and say, yes, that's right, but not a lot of originality.