Yeah, I had thought about a topic when the game came out, but I had already made about three or four Tekken 6 topics in the past so I figured I should take a rest!
The game isn't awful any way you look at it. The only group of people who I've seen continuously bitch about the game would be the posters on the GameFAQs Tekken 6 forum, but they'll bitch about any new game that comes out anyway.
Online is the only other poor aspect of the game. It was a bit laggy after the game came out, but I was still able to win some fights without bitching too much about the input delay caused by it. A patch was made available last week to address online lag, but I haven't played Tekken 6 since then (Assassin's Creed 2 is eating up all of my gaming time).
To be honest, it's my favourite Tekken game of all time already. Dark Resurrection on the PS3 was my previous favourite (no loading between fights was awesome), but Tekken 6 just has so much style and fantastic gameplay that it's impossible to shun it if you're a Tekken fan. I only know one person in real life who played it and wasn't impressed, but that's because he has mained Hwoarang since Tekken 3, and ol' Hwoarang's movelist changed a fair bit in Tekken 6. He did not like this one bit.
The character roster is fucking gigantic for a 3D fighter, and there is a charater there to fit everyone's playstyle. Before dismissing Tekken 6 and claiming to be unable to enjoy it, I really suggest giving EVERY character a go.
And speaking of the characters, Tekken 6 has the best bunch of new characters since Tekken 3. Nothing can top the introduction of Jin, Eddy, Hwoarang, and so forth, but Tekken 6 comes pretty darn close with Miguel, Bob, Zafina, Alisa... And speaking of that femme bot from Hell, I can't stand her. She's good for the series and all, but man, I can't fight against her when it's another human using her. She's too damn fast! My Lee doesn't do a whole lot of good against her, so I have to resort to pure beatdown with Paul.
Some people online moan about the graphics in the game, but really? They're just fine. They are slightly dated overall, but the character models are still impressive. The skin texturing on some characters, such as Kazuya, looks fantastic. Also, Tekken 6 has the best lighting I've ever seen in a fighting game. It's really nice!
The music is also pretty cool.
I could probably praise the Tekken 6 forever, but I'll just let the game itself do the talking. Not sure how good the fighting is in these videos because I didn't watch too much of them, but at least they'll give you good idea of how it plays.