>>21767638Looker missions can be completed in 2 hours, max. Megastone hunt doesn't really have anything to do with the actual gameplay of pokemon, it's a glorified fetch quest that can only be completed in a 1 hour span at a time.
Battle maison at least has replayability, but it's also repetitive. frontier is supposed to test your trainer ability against a multitude of unique battle scenarios, which is why it's interesting.
That being said, I am withholding my judgement on ORAS postgame until I get my hands on it, but X&Y had a pretty undeniably skimpy postgame. At least in B/W there was some new areas to explore.