Your portfolio can just as easily be a patchwork of half understood code cobbled together from the internet just as easily as it is totally you own original work.
I agree with frob that your professional work history is a bit more important. Making games is a job, generally a fun job, but a job nonetheless. Granted you didn't do 100% of the work and may have coasted from time to time but it shows you were able to work with a team and get things done on a reasonable schedule. Working on and hopefully completing projects on your own is great and isn't something that a lot of people can do. But working on something when you want to isn't the same as working on things when you have to.