I would very much game on my Macbook pro but the keyboard seems a bit fragile for some intense key tapping. Say for games such as Starcraft 2 and what not.
Been gaming on my laptop for almost 3 years now. Keyboard's still working. You'll be fine eh.
And I'm a college student too. I was 17 when I bought my 15" Macbook Pro. I'm a very weak female, and I'm only 97 pounds. It wasn't that big a deal walking 2 miles everyday to school carrying my 15" MBP.