You can get better exp with a 2x card than from CPQ, and it's probably not that hard to do.
Of course, that ^ is accounting for the fact that people lose sometimes, and the difficulty in finding a party to take a lolbowman, and the time it takes to find an opponent/start a match.
For me, on the other hand... I never lost a CPQ where my party members did not go 1) afk or 2) quit ./brag.