About this whole "isn't it the same with every fighting game?" argument, let me say no. Not at all.
The jump from Tekken 1 to Tekken 2 was OMG OMG OMG.
Then Tekken 3 came out and it was just like Tekken 2, only a step further in pretty much everything. Though, as soon as the intro movie started, I knew the game was good. It felt good.
Same with Tag since it was basically Tekken3, and I bought a fucking PS2 on launch day, waiting in line for 10 hours just to play TTT. Again, no adaptation time. Instant awesomeness.
Then Tekken 4 came out, they tried something "new" and failed miserably. Everything felt wrong.
Thankfully, Tekken 5 / DR went back to "Tekken 3" 's gameplay, again, everything felt awesome as soon as the game started.
And with every game, it became more and more impressive visually.
Now Tekken 6 ... it doesn't feel as bad as the fourth but come on, it's clearly not on par with the series quality I'm used to. It just doesn't look good (what's with the browns and all that...??), it feels a little sluggish, the soundtrack is forgettable, the loading times are terrible, no story mode ... it doesn't feel polished at all... hell, even after the installation on PS3, there is still an insane amount of loading...