Sorry for the double post, but I just want to end this:
You could get better quality games than DS no matter how much you spend, plus it has all your other PC uses
If you don't spend at least $800 on a laptop, most games will run like stuff. It's hard to enjoy a game when you run it at 15fps. Besides, the DS is $130 and no laptop can compete with that price
Not THAT big of a deal imo
But what if you want to play on the bus or in a doctor's office? Not only do you have no access to the mouse wheel, the touch pad is NOT a good way to play any game.
Backpack
Would you really want to carry around a backpack everywhere? I don't know about you, but I find it much easier to just have my DS in my pocket.
Don't do stupid stuff with it, like leave it in a second story window, and you'll be fine
But it's easy to drop your laptop if you carry it around a lot and it doesn't take a lot to break them
If you actually had a need for a portable game system, you would understand why a laptop isn't practical.