It's simple, if you want a fighting game, this has to be it.
However, if you've played Tekken 5, like most buyers of 6 will have, you might want to read some reviews before you buy.
The Arcade mode, is exactly the same as Tekken 5, except theres a few new characters.
The Tekken Force Mode (scenario campaign), is a bit wierd, the movement of the characters is a little bit wierd, anyone who's played it through might agree.
The King of Iron Fist battles, well, they've almost vanished, it's 3 fights, then you take on the boss, which, true to Tekken style, is insanely overpowered.
This isn't a negative review, the game itself is very good, but... It's too closely related to Tekken 5, even the taunts at the end are exactly the same as 5.
If you haven't played Tekken 5, I would highly recommend it.
If you're on of many who have played Tekken 5, I'd recommend trying it out somewhere first.