I got Perfect Patio (indirectly) because of the hot tubs, as it offered better gameplay than the alternative (luxury party, refused to touch MFP). If I had've known hot tubs would be patched to base game, I'd've got LP instead. I spend some time saving up to buy the packs I own, so I feel like I've wasted money.
I do feel for base-game only simmers though, and I would've been less annoyed if they'd given us an in-the-ground or curved hot tub. While there would still be no new game-play involved for Patio owners (so still disapointing), it would've at least offered us a new look, instead of a frankenmesh/remesh(?) of items we could've combined ingame using moo.