I've served on a jury twice, once before I started identifying as an anarchist, and once a few months ago. Needless to say, it should be your choice to serve; it's no good that the state coerces people into doing this. Indeed, because of its coercion the state feels free to treat jurors like cattle. On the other hand I, as an anarchist, still chose to serve (I could have easily been excused), and I'll explain why.
Serving on a jury is an incredibly educational experience. You get to see the mechanisms of power from a different angle. The whole time I was there, I was thinking how the cards were stacked against the defendant, even in the face of the supposed institutional counterpower of "due process". It also forced me to think more deeply about how the necessary violence in a society should be mediated. There's no way for a person to be untouched by violence, and to pretend that you can avoid it, or it doesn't exist is not defensible. I was on a rape trial. Violence is completely appropriate against rapists. I still felt terrible, deciding to restrict someone's freedom. I don't want to do that, ever. But I refuse to be a bystander.
People rely on the "justice" system. The shouldn't, of course. They should build alternative institutions that better respect human dignity. But they do, and the jury system is the best part of it, a little corner of relative anarchy that the state has so far been unable to remove. When you choose to sabotage the system, as with any sabotage, it's wise consider whether the human cost is worth it. At least if you're present you can stand up to unjust laws, something the other jurors might be scared to do. Moreover, you can demonstrate your principles to the other jurors. Don't go overboard, but what better platform to advertise your beliefs? In the end, I didn't consider myself so much a traitor to my community as an ambassador to another, and while I disagree with their customs (do I ever), there are still things I can do under the banner of mutual aid.
Don't dismiss the arguments in the other direction either. As always, the choice is yours.