A power heavy, combo heavy fighter that really rewards chaning combos together unlike any other game in its genre. And since the game is 9 years old and completley finished updating, you can see a lot of love and care that was piled onto the title over the years. Definitely pick it up on steam, it's a solid fighting game that still has an equally solid playerbase.
I really gravitated to this game and enjoyed it more than most fighting games. The character designs were faithful to the originals and in most cases were massive improvements, with a few cases of butterface going on with the female characters for some reason. The fighting was snappy and easy to learn and the presentation, especially after the big update, was really well done.
It's essentially the kind of package I look for in a fighting game. Great online, solid system mechanics, and a diverse cast that is fun to play. The fact that I am putting time into multiple characters to experiment with is a testament to how interesting their tools are and allow to approach Killer Instinct's systems in unique ways.