Granted, I'd had a couple of drinks before the show, but I thought it was pretty damn good. It struck me that the movie played out as a series of missions, and that the director didn't stray far from what made the game series so fun.
Agent 47 is more interesting in some ways than 007 because, while he's an expert assassin he's also socially inept. As for his background, they didn't bother to waste screentime revealing what we already knew of him from the games. While I appreciated that as a gamer, it could alienate newcomers.
I hope you'll enjoy the movie for what it is, a faithful translation of the game.