Games Radar 4/5
http://www.gamesradar.com/killer-instinct-review/
A year from now, Killer Instinct could be one of the best fighting games ever made. In its current state, it feels like the inherently replayable foundation for something bigger. The general lack of content is made up for by the mind-blowing fun factor, where pick-up-and-play controls meet meticulously crafted game mechanics. And despite the sensation that I've seen everything there is to see, I suspect I'll still be playing KI for months. Because sometimes, an awesome piece of a finished product is all you need to enjoy yourself.