While I'll won't comment on the content of the movie and how peoples likes / dislike it, I'll remember you that there is NO way they could put everthing in the game in the movie, neither can they put the full extent of any route / event. It would make for dozens of episodes, as well as serial series of episode for the different route / ending.
In short, they had to make some choice on what they'll put in the anime from the game. And it's sure as hell won't please everyone.
I'll personally wait until I've seen the full anime (both episode since only n°1 is released) to make a final judgement.
The only think I'll like to know is if the dev of the game they've been putting in anime as much to say about what they put in the anime and how, or they're free to adapt once they got the right for the anime adaptation ?