Note, the "realistic space battle" doesn't necessarily have to be the boring, simplistic image people often invoke. It all depends on tech level and conditions. Most analyses dealing with space battles simplify a lot and assume even more. For example, "unblockable RKV bombardment" won't happen if you don't have tech to propel stuff to such velocities. IRL, lasers lose coherence after a while, missiles can be shot down and mass drivers are limited by a number of structural and energetic constraints. Most "realistic" discussions of space warfare assume that those difficulties were overcome, but it's perfectly possible to write a story in which they weren't. It's even possible to make things such as fighters and "space stealth" perfectly viable, as long as you have a good idea of what kind of "tech level" it'd take.
That said, it'd take a mighty odd way of tech development to end up with anything remotely resembling FS2. Not to mention the fact flight physics are utterly wrong (not impossible to change) and orbital mechanics are not simulated (big problem, orbital motion is very different from what we're used to, and fighting for empty space sounds unlikely).