Saw it Thursday night and again last night. I really enjoyed this one. It goes in the top three for sure. It does start slow but it has to develop the characters. Cassian killing the informant lays out the darker nature of this movie and the rebellion as a whole during this time. Also shows how unorganized the rebellion is and that they have division themselves with Gen Draven wanting Galen killed instead of bringing him in to question. There's no cutesy humor or love story. K-2SO does bring comic relief into the movie but it's deadpan and serious nature that gives him his humor.
Lots of little Easter eggs. Most have been mentioned but I'm not sure if the blue milk Jyn had in the opening scenes was pointed out. I thought it was a nice touch.
Vader going full Vader in the 3rd act was the best part of the movie. Wish we could see more of that.