I watched Holey Moley this evening, partly to see the sneak peak of Big Brother, and partly because i did not have anything else better to do, and i agree with you there.
I liked the concept (reality mini golf show), I liked the format (wipeout with golf balls), and I liked the competition structure (from 8 to 4 in the first round, from 4 to 3 in the second round, and from 3 to 1 in the third round).
Furthermore, judging by what i can see in the TV guide I like the sugar hit nature of the series (3 weeks of 3 episodes per week making 9 episodes in total of which 8 are competition and 1 is the grand final).
What i did not like is how the episode seemed to drag, in they could have condensed it down from 90 minutes to 60 minutes, by doing away with the cheesy "interviews with the shark", etc filler content.
In a nutshell, I would give Holy Moly a (B) Grade, for fun family entertainment, even though the show did drag on a bit longer than what i felt was enough for one sitting.