Yeah, I concur with what's been said here--I don't think there's anything wrong with the pack, as long as you appreciate it for what it is. If you like sending your sims camping and that kind of aesthetic, I say get it, you'll probably have a great time! Is it my FAVORITE pack, personally? No, but I'm not a big camping person. Still, I've had a lot of fun on vacations there with my sims in various stories regardless. The herbalism stuff is pretty cool, I love finding the the hermit, and it's nice sometimes just to "get away" for a while.
Here's the thing: first thing I do in every save is replace or make over all the lots, lol. I either simplify or jazz up the main camping ground, then add some combination of different rental lots I find from the gallery: a honeymoon cabin, a cheap one-room writer's retreat, a super expensive luxury vacation lodge, a family get-away rental with toddler stuff and a rec room, and then I'll replace the national park with some other public lot like someone else here mentioned--a spa, or a proper park, or maybe a "natural" museum with bugs to look at and stuff. Once I started doing that, I started loving Granite Falls a LOT more, lol. Cause I think the most frustrating thing was going on vacation, and getting to an "editable" (without cheats) home lot that frankly...sucked, as a build. But, if you don't mind downloading from the gallery (and there's a LOT of great GF themed stuff out there), or doing your own rebuilds or remodels, I'd say there's no reason you should hesitate to buy the pack. Just get ready to maybe be a lot more tempted by those weather resistant perks ;-P