This absolutely baffled me, too. I like fluffy, open-ended abilities, but even I am not a fan of the current Divine Intervention and it seems pretty much the same, despite the whole 'Let's not make abilities GM dependent' conversation. I had a Cleric player in a campaign who managed to roll low enough to trigger it at level 11, and when it happened we both sat there, non-plussed. What happens? Deus ex Machina? The effect of any cleric spell seems a bit much when all the fighter gets is another attack every round.
In some systems, this wouldn't be a problem. But D&D is so tightly coiled around the idea of 'pull this trigger, get this effect' that the sudden permissiveness seems really out of place.
So the party was chasing an arcanloth that was in humanoid cat form and impersonating the goddess Sharess/Bast. They narrowed down the lair's location at a brothel in the world's version of Las Vegas.
They knew that some fiends could teleport, or even astral project, so the cleric of Anubis did a Divine Intervention check and made the percentage.
I asked them what they were praying for, they said "We know the creature is in this building, I'm asking Anubis to lock this place down, so they cant teleport, project, nothing..." We agreed that it would be like that spell (forbiddance??) or something, and absolutely no travel of any type, physical or mental would be able to leave the building.
They cornered the creature, and slew it. I described it as taunting them with its final words, and promising revenge when it returned from its home plane....
...the cleric said "I made the god call, so I've got Anubis' attention and asked for a total lockdown?" I said "yah".
"So its soul can't escape to its home plane then" I said "yaaaaaahhhhhh"
"So its permanently dead then right?" I said "Crap...YES IT IS!"
And there was much rejoicing....