I don't know what all the complaining's about. I thought this was the best Child's Play in quite some time. Curse was a solid entry in the series, but personally I didn't find its return to the more serious tone of the original movie to be the greatest thing that ever happened to the series, like most people seem to believe.
No, I much preferred Cult, which instead of moving backwards and retreading the original movie, goes forward in an interesting new direction. I don't want to spoil anything, so I'll just say there's a new spin introduced to the classic concept of Chucky that leads to some interesting plot twists and some crazy possibilities for the future.
Yes, there's some pretty silly stuff happening sometimes (though not anywhere near as cheesy as 4 and 5), but this is a long-running horror franchise from the 80's, what do you expect? I thought the balance of seriousness and ridiculousness was just right in this case.
I disagree with the claims that the movie was too slow. Yes, there's not a lot of death in the beginning, but the script is well-written and the cast is solid and they both carry it well as things start gradually ramping up until the complete insanity of the final act. By the time it was over I was so into it that I was sad to see it end already. I really hope that Mancini picks right up where he left off here, because I really want to see where he takes all these strange new developments and Cult of Chucky has left me more excited for the future of this franchise than I have been in decades.