If you are a fan of the game, then there's no doubt you will love this movie. I went in with no expectations, except knowing that it's a prequel. That being said, I was very impressed by not only the quality of the movie, but the pacing, character development, seamless crossover between the prequel and the original game, while introducing new characters without harming the original.
The story was simple. But very effective. I really enjoyed the Yuri/Flynn bond throughout the game, and it was great seeing the roots of it in this movie, while also getting some more back story on Flynn's past. This movie had be laughing at loud at some parts, and crying at others. It was a roller-coaster of emotions, but it was a complete package.
I didn't feel cheated or upset by the way things were done, in fact, I think many other game to anime adaptations should look at this movie as a role model. Simply perfect.
I really enjoyed it, and I'm certain so will you, perhaps even if you have not played the game. Definitely check this out!