The name Powerscourt House and Garden is confusing...

The name Powerscourt House and Garden is confusing. You'd think there's a house in the tour. The house was burned down and was reconstructed, only to the point where it is full of gift shops and restaurant. Non of the old Castle interior was restored to the old castle's state, which was very disappointing.
The gardens are indeed nice and beautiful, only they are way overpriced, not justifying the admission fee, which does not include the waterfalls that require extra money.
If you're willing to pay a lot of money for an hour or so of nice gardens, and no more than that, then go for it. Otherwise, find a different castle to visit.