The next gen consoles are here for one thing, entertainment.
And when you want to entertain yourself you tend to have options in life.
For us then there will be choice as to how and with whom we do it, with hopefully more than two options on the table.
Since these consoles are inevitably heading towards providing "cinematic like" experiences to their audiences (according to the beloved mega corporate hype machines)
then just as you would step into a particular style of cinema to watch a particular style of movie, you too would make a hardware purchase based on the assumption that you would get a certain style of entertainment experience.
Usually these choices rest firmly on the knowledge and past experience of that company and its products.
What the REV is offering here is choice, and really I don't know why some people seem adamant in attacking that concept by perpetually trying to elevate it into a entertainment space that its clearly not designed for or aiming at, unless they are really just being bullies.
REV is not about "blockbuster movies", its about offering something niche, perhaps cute, certainly innovative to its audiences and we know that there is market that responds and consumes that because Nintendo is still here.
The REV will do nothing to detract from the gaming experience of PS3/360 owners other than perhaps providing, irksomely, similar entertainment value for a much less price for a lot of people.
Choice is the good side.