I have served on a jury before and was amazed at the process. I thought it was a great educational experience as it offered me the chance to take part in our justice system.
I was a bit disgusted with what I witnessed in the voir dire process. Potential jurors were dismissed by the dozens (or so it seemed), not because they did not have potential to do their duty, but because they weaseled out of serving. Some of the excuses they used were not even believable!
We did manage to have one member on our jury who voted according to his own agenda, rather than with the overwhelming evidence placed before us against the defendant. Our foreman basically let everyone know that we were not going to be going anywhere until we all voted together, and after about 30 minutes and another review of the evidence, we finally got a unanimous vote.
Some people are not interested in justice. They just want to work the system to progress their own agenda.