I've only served on one jury and it was a battery case. It lasted a week and was the most boring time of my life. I never had such a hard time staying awake. It was actually painful how boring it was. The lawyer would just keep going on and on about a stupid detail that had zero meaning to the case. In the end, it was all BS and we all voted that he was innocent. She said he attacked her, but he was trying to get her out of his house when he caught her doing drugs in his bathroom. She was a nurse and thought she'd accuse him of battery so nobody would believe him if he mentioned her drug use. Not one of us believed her, and of course, her friends all got it backwards when the testified too, so it was pretty ridiculous that there was even a trial. When it was over, the lawyers asked us for our opinions on how they did. I told the Assistant DA that it was a stupid trial and he had wasted our time on something that never happened. After I told him what I thought, most of the others on the jury told him the same thing.
I served on the grand jury for a year, most cases were good. But we did have 1 make that 2 cases brought before us with the same victim (in the eyes of the law only) and different defendants. Me and a few of the other sane members with kids roughly the same age balked on the 1st and everyone was on board when they found out about the second. If you have enough people with common sense on the GJ screening the cases you won't have to sit through that.