Just saw it last night. We were planning on seeing 1917 but I guess it comes out on the 10th. Anyway, I was pleasantly surprised with the movie. Sandler's acting was good and definitely not what you expect out of him. I thought the movie was a bit slow at first but it did a good job of building up and as mentioned, I think being a Celtics fan and a KG guy, it definitely added an extra element.
I have some other thoughts but don't want to spoil the movie so I can share it later. Ultimately, I wouldn't necessarily pay to watch it at the movie, but don't regret that I did and it was one of the movies that makes you thinking about it afterwards.