It all depends on what you want to train. If the game is used as a stimulus to which you have to react, and you are training thought processes to be ingrained, then you can do a lot with the game that you'd be hard-pressed to do otherwise. This is especially true if the point is to work through staff processes and battle tracking. Any game can provide a suitable stimulus for that (ie, you don't need JANUS and 4 days of puckster training). If the game is intended to create some form of muscle memory effect, then yes, it needs to be much more tightly coupled to reality (Weaponeer).