It's not a replacement over a 360 or PS3, but if you find yourself away a lot, and want something to pass the time, I'd reccomend it.
GTA: Vice City is a must, WSOP: Tournament Of Champions is another I play too much. MLB:06 was a blast so I would imagine 07 is just as good if not better.
I've never really used the online function as I buy most of my games used. By that time, the server has changed, or people are so much better at the game than little old me that I'm lost in the game play.
Again, not a replacement for the next gen systems, but might be worth it. I just never understood the appeal of a pen to play games (DS). And I don't think Nintendo released any sports games for DS either.
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