I agree with all your points, but I scored the game much lower, personally. Had I waited and bought the complete experience when it was all released, and spent maybe £20 on it, I probably would have given it a 7 or 8 out of 10.
As someone who preordered the game back before SE changed their mind about the model, and lived through the beta and all the initial teething problems with the 'always online' disconnects and framerate issues, Never before have I spent so much time with such an underwhelming drip-fed package: it gets a 4/10 from me.
For me, it was the lack of valuable content. Elusive contracts have been a big disappointment for me, and Escalation contracts compound what was wrong with the release schedule: forcing me to replay a section or level over and over and I end up feeling like I've played the game to death. And for what? A new SMG with a camo skin that I'll never use?
I recently tried playing through the game from start to finish and I got as far as the final bit of Sapienza. I couldn't finish the level; I was just so bored of it.
I thought Showstopper was the high point of the season. Sapienza could have been great but there is so much wasted space. Marrakesh is just terrible. Bangkok was ok. Colorado had some great moments, and Hokkaido was pretty good.
I've seen some people fawning over the release model because it 'gives the player the chance to really explore each level' - I did that anyway when I had access to the full game with BM/SA/Contracts, but I at least had the freedom to move on to new content if I wanted to.
Hitman 2016 really was too little at a time though and just meant that I frequently had a month or two with a lacklustre level: I spent most of the last year with Hitman hoping that each subsequent episode would be truly great but never really got what I wanted.
Little things which were missing from previous titles weighed heavy on me. Not being able to carry poisoned food to targets, or hide weapons in crates, or have access to a briefcase, or be able to use npcs are human shields.. Or even survive a gun fight if things went wrong, actually. It felt much less flexible than Hitman at the height of its powers, which I still believe was Blood Money.
On the plus side: the game looks fantastic. I thought the story had a lot of potential (ultimately I was annoyed that they didn't resolve anything or indeed really advance the narrative. What is Providence and why should I care? I wanted to see more of the Shadow Client - I thought he'd end up being everything Mark Parchezi should have been in BM). Some of the scripted sequences were truly great, and I loved walking the runway as Helmut.
I won't be preordering season 2 if it happens. I'll wait until the full thing is out and then judge it accordingly.