To be honest I would put Blizzard’s Titan at 1 out of 5 or even 0 out of 5. They realized the game wasn't going to work and as you mentioned turned it into Overwatch. Not only is it the best FPS of the year and one of the best games of the year, it has all the best qualities you could ask from Blizzard with a game they have never done before. At the same time it doesn't take any business from WOW which also allowed them to continue to release new expansion packs. Keeping their existing customers happy which increased sales while also expanding with a whole slew of new customers? Win, win and win.