Agree on the acting, all of them did very well, no complaints, it was just that the story was trying to do too much, but also really ended up doing nothing, and yeah too much fan service.
Also, the timeline doesn't really matchup with what the show said examples, Tony was born in 1959 so in 67 he would've been 8ish which in the show flashbacks he was, in this, he's at least 12 or so. Also it said Chris was born in 71/72 and Dickie was killed shortly after so in 71/72, Tony would've been 12-13 but he's shown as being 16-17 or so.
Also they mentioned many times that Tony, Silvio, Ralph, Jackie Sr etc grew up together and had their little crew, but in this he's at least 10-15 years older than Tony, same with Puss, whereas in the show they were both close to Tony in age, like within a year or two. And yeah, Sil seemed just like a caricature of the show Sil. Puss and Paulie were alright, not too over done, but Sil was bad.
Agree they should've left the ending more mysterious, but yeah, the reveal fits with Junior's petty, insecure personality.
IMO, it should have been a 2-3 episode miniseries instead. And get the timeline right.