He's a great person. His acting range is limited, but within that range, he's good at what he does. Whether that makes him a suitable actor for a computer game is debatable, but on the other hand, he's also a beloved actor, so it's probably good PR.
I have no problem with them including Keanu in the game. I do have a problem with crunch and releasing a very buggy game.
I take Tom Hanks or Bill Murray over Keanu any time, but he's extremely dedicated. The amount of work he put into gun and martial arts training...Maybe that's part of being a good actor, after all.