I bought it and played it. It's very hand-holdy, almost guided to an extent. The entire time you have the white ghost (I already forgot his name) nagging you to do something specific to advance the game. If you do what it tells you to do, you can seriously finish it in five minutes. If you take some time to monkey with what little you can interact with, you can milk 10-15 minutes out of it.
Atmospherically, it's great. The inside of the firehouse is cool as fuck, though it's kind of dark which makes it hard to appreciate the detail they put in (or maybe the dark hides a lack of). You can only interact with a small subset of things in the environment, so the usual "If you it's not nailed down, you can pick it up" that we've gotten in other VR games like I Expect You To Die is not true here. This is especially disappointing in the lab area in the back; gadgets everywhere, and all you can interact with is the proton pack you need to assemble.
Graphically, it looks good-ish, certainly better than the "PS2 era graphics" someone pointed out from a YouTube video of the Google Cardboard version of the experience. The inside of the firehouse looks alive. Things are detailed enough, and they threw in a lot of neat touches like one of Kevin's glossies (him shirtless holding a saxophone) and the mansion from the all-female reboot on the receptionist's computer screen. When you're up close with Slimer, he looks pretty cool/gross.
The gameplay is scant in the sense that you spend most of the experience teleporting around to do whatever objective the ghost tells you to do. The brief moment you have with the proton pack and trap are cool. It was really satisfying gripping the proton pack with two hands (the game *requires* two PS Move controllers) and wrangling a ghost towards the open trap. I'm hoping that subsequent chapters (it says a new chapter is "Coming Soon") lets you do more ghost busting.
Whether or not it's worth the $7 depends on how big of a Ghostbusters fan you are. I loved the old movies and did actually enjoy the reboot from last year, but still feel like it's priced a bit high. You can get more gameplay out of something like "Oh my Genesis" for half of the price. I hope the subsequent chapters will just be free add-ons, but something tells me they won't be. I'll definitely be a bit more discerning with those purchases now that I know what to expect.