So, the theme isn't something I cared much about to begin with, and I felt pretty neutral about it. But I do tend to make the best of a pack for my own gameplay, so I got it in release day.
Any real issues I had were due to Origin and Windows, not the game itself. Once I checked my firewall and cleared Origin cache and updated, my game ran super smooth. I play with a pc above minimum specs.
There will be some bugs, they come with every pack. Sims games in particular have potential to get buggier the more DLC you add. But I haven't found anything game breaking, just little annoyances.
As for gameplay being worth it, I've had two households go on vacation for three days each and still have not come close to having maxed out any sports skills or seen everything. The hiking has many paths in different areas to be explored, much more than I thought. I have seen two of the festivals (meh, but nice for neighborhood liveliness) played around on the Bunny Slope, only used the large slopes once and couldn't go mountain climbing because my Sims need skills, so that whole area needs to be explored. The hot springs fit a lot of Sims and I like them more than I expected for something so similar to hot tubs. I actually like them a lot better. I still don't really have the hang of lifestyles yet, they are something that takes a while to build up. The hot pot and low table are actually really nice and Sims use it pretty well, with only a little bit of musical chairs (in my experience). The general simulation of the activities is good and fun for screenshots, with new entertaining animations.
This pack feels like a proper expansion to me and has potential longevity because it takes time to complete the activities, as it should. I will add that I play many different households and when I get a new pack I incorporate it into my gameplay as normal, I don't try to rush through it with cheats to see everything. That's how I can tell if something holds its value in my gameplay. I would say it's worth it.