I think the USP for this one is clear: go for Sasha/Digweed if you're fans/never seen them/curious (this year could well be their last run together. or for another decade)
and/or
go to see Privi in full swing with a house & tech music policy.
I agree, the rest of the roster is filler and samey to elsewhere. I wouldn't go to Resistance solely to see Matador, Paco or EE (though I like them all). But I wouldn't go to any other Ibiza party on that basis, either.
Most people are on the island once a year for a few days. A fortnight tops. I think it's a decent option for somebody like me who doesn't want to spend the whole week in Amnesia, and who'd like to check out Privilege. For me - as good as Vista is - I consider it almost like a separate venue.