The complete game of TWO came with my Xbox Live Starter kit (ver 2), so I didn't really shell any money out for this title. It was definately worth the free price tag.
It is pretty much the same Tetris that's been out for years, but with a few more bells and whistles. It, of course, adds the online feature, and more game modes than the original. Playing online is ok, but Tetris has always felt like more of a solitaire game to me. There's nothing really wrong with the game, but it is pretty limited.
This is a hard game to rate on visuals. Obviously, you do not play Tetris for the visuals, and if you are, you haven't seen a modern game in years. But, the various backgrounds look good, and everything is what you'd expect.
I was surprised to see TWO had the custom soundtrack feature. This alone almost makes it worth playing the game. Really nice addition. I've never really listened to the default music that is with the game, but the rest of the sound effects are fine.