KOF 13 is amazing. It just has really bad net code so it can't be played online. Also its has a steep learning curve. But the game is really balanced. I think it and Tekken tag 2 are the best fighters on the market at this time. But i play fighters competitively, so my opinion is going to different from the person who wants a awesome single player experience, because i don't give a shit about single player when it comes to fighting games.
Also there are rumors that KOF13 is headed to steam. This could be great for the game as the net code could get fixed, and make the game playable online