Game movies are usually rated (by the game fans) according to two things:
1- How much different the plot is.
That’s how it always was and always will be. For example, Prince Of Persia: The Sands Of Time movie wasn’t admired by Prince Of Persia fans because of Jake Gyllenhaal (who was totally different from the Prince) and the different plot. Everyone was like “Why call it The Sands Of Time if you’re not going to use the game’s plot”. Not to mention that what Dastan (a.k.a. the Prince) was wearing in the movie was from Prince Of Persia: Warrior Within game. At the end, we got a good movie but a terrible game movie. If you watch it as if it was just a movie you’d like it, but if you watch it as a movie based on Prince Of Persia you’d hate it!
One of the greatest games out there (I didn’t play it but watching the gameplay was enough) is getting its movie soon, this game is The Last Of Us. The Last Of Us has a great plot, great characters and an amazing environment, so the movie should be great, but is the plot going to be the same? YES! Neil Druckmann said that the movie is a game adaptation, in other words, it will be a re-telling to the story of the game. So The Last Of Us passed the plot stage!
Now what remains is the casting, which shouldn’t be difficult because Joel and Ellie from The Last Of Us are very “clear” characters with crystal clear features and ages. If I had the chance to pick the actors, I would pick either Hugh Jackman or Gerard Butler for the role of Joel, as for the role of Ellie, it has to be Ellen Page and nobody else. Although she’s a bit old for the role but her height and features say otherwise. She’s the one for that role!
The Last Of Us will make a great game movie. I expect it to be the highest grossing game movie of all time!