Depends on whether you find the game worth your time. I don't. But be that as it may...

It depends on how you are playing the game:
Are you good at mini-games? If so, then play it.
Are you trigger happy (hahaha what a pun, no one cares): If so, then play it.
Do you like third person shooters? If so, then play it.
Do you want 100%? If so, then play it.
Are you competitive? Well, this one could go either way.
Or do you just want to beat the game and leave it to the side (which should take around 20 minutes)? If so, you might as well, seeing as you paid money for the game, you might as well milk it for all its worth (which is not a large sum, BTW).

I myself fall under the last question. The game in general isn't great, but since you have it, might as well use it.