It's good, but overrated.
As in most of my reviews I'm just gonna give some explanation, and mention the good&bad points of the game.
This is the 6th Tekken game (don't forget Tekken Tag Tournament), and has new characters new modes and customization options for your characters.
Don't misunderstand me, there is no 'create your own character', it's just buying stuff that u then can equip on your character. It's pretty fun sometimes though.
There is a new Devil within mode, an small action/adventure game with Jin, searching for information about his past.
Positive points: +Outstanding graphics.
+Good sound.
+Pretty good cast of varying characters.
+Many modes.
+Includes arcade versions of the first 3 tekkens.
+Very cool, and sometimes funny endings of characters.
+Fun in multiplayer
Negative points:
-Cheap and frustrating endboss (I'm no pro, so it maybe easy for the better players, but I found him extremely cheap, and I think every beginner would think that).
-Inclusion of the first 3 tekkens is cool, but who's gonna play them when u have Tekken 5?
-The Devil Within mode is very liniar, and repeating, where almost all locations (in the same stage) look VERY similar, and with very annoying music in the first stage.
-Faster finished then u would think, when completed Devil Within, unlocking every character, there isn't much more to do then finish story mode with every character for their endings and gaining ranks in arcade mode (what's actually good for nothing except for gaining money for equips).
In the end: Good if u havn't played truly fast beat-em ups, with very good graphics, but faster finished than u think.