I was not a fan of Andrea's character, she just never clicked with me, but I certainly didn't hate her for shooting Daryl.
I wonder/hope some of what they're doing with the zombies this season is actually paying attention to the zombie gunk, gore, juices, etc. By the end of season 4, there were times they were covered with that stuff and just carrying on casually. In season 1, they made it a point, when they were covering themselves to get out of Atlanta, not to let it touch their skin. I don't mind if it gets on them, but if they have an open wound, or it gets into the nose, mouth, ear, etc., then it should have some effect.