OXM US writes:
"Do this small little exercise with me. Think of all the videogames you've managed to finish since you've started joysticking and try to remember how many of them actually contained an open-ended conclusion. "Well, duh," you're probably saying to me through this screen –– "That's pretty much all of them." But think of it this way; think of the games that ended in question marks rather than ellipses leading to the inevitable sequel. So, this means that games like Mass Effect and Halo 3 are out."