I thought it was great. I like every Godzilla movie though. Overall it was a solid entry into the franchise. Closer to the top of the heap than the bottom. Curious to see the varied reactions from the rest of the fandom, since everyone inevitably has different takes depending on what they like out of a Godzilla movie.
I encourage everyone to go see it, mostly to give Toho your money so they know the international market remains eager for more of the big G.
It's a high quality film. I prefer Shin, but Shin is my 2nd favorite in the franchise. Depending on taste I'm sure some people will prefer Minus One over Shin. It's all up to what you like.
Ultimately though, they did a great job on Minus One. If you're a Godzilla fan you're going to love it.