I'm enjoying the song quite a bit. Bout to give it another listen after running some errands.
There are some minor things about it that I can nitpick, but I can do this with all of their albums. I had nitpicks with 10,000 Days, and yet I still enjoy listening to it a lot; it has some great moments. I think Fear Inoculum will be the same way.
The song does recycle some "Tool sounds", and I notice it the most with Adam's guitar. I think he does this purposely a lot, as I remember them talking about how Rosetta Stoned was him repurposing a lot of older Tool riffs in a new way.
But at the same time, this isn't really a bad thing. In fact, this sounds way better than most older bands do when they "come back" with a new album after a long time. They don't have to recapture the magic or fit with new trends; they still have it, even if at times it does sound somewhat samey to their older music. And Fear Inoculum definitely is a song that doesn't "feel" like 10 minutes, and it has some great moments, and leaves you wanting. I think that is the point of the track, especially if it's the first one on the album. The ending that a lot of people say "sounds by the numbers" is actually my favorite part, because it builds and sounds great, like it is building into something; the rest of the album. We will see how it fits into the bigger picture.
The song also doesn't necessarily "give" you want you want as a listener, but still sounds great and delivers a great vibe. I'm happy with how it turned out, and I think with the three songs I've heard so far, it will be a solid album.