I'm going to just single this out because it really fits. Logically as the former Director of the Time Bureau Ava is the best choice for second in command among all the Legends as she has actually experience commanding people. However, the problem is they keep showing Ava as very VERY incompetent at leadership, far more so than she should be. I'd be much more accepting of the idea if they actually showed Ava as a different but still effective style of leadership. The way it is now they make even MICK RORY look like they would be way better at leading the Legends than Ava would ever be, and that's just sad.
Which is weird since they've already established that what Sara sees in her visions doesn't have to come to pass, she's averted them several times. When I heard Sara's "vision is happening" sound and then Sara lied about not seeing anything I knew where this episode was going and I HATED it. I could understand Sara being a bit freaked out, but not telling anybody she's going to die? As she explains to Ava Sara even knew exactly how she was going to die.
If Sara had just told the Legends this the team could have at least tried to come up with somewhere else to go, and if that bar was really the best option they could have spent the time they spent drinking and screwing to shore up the place and keep the zombies out a bit longer rather than what they managed to slap together in a couple minutes as they did. Worst of all, if she HAD, the Time Courier would have charged and been ready and the Legends could have left to the Waverider with time to spare. It would've been one thing if they fortified the place, the zombies still broke in, and the Legends all got killed anyway, but with the way Sara was being this episode maybe she should pass the torch since she's clearly lost her touch. Yeah yeah I know, they're all going to come back anyway, but that's no excuse for a plot that's written specifically to kill them off with a really really simple and obvious way out. If you're going to kill off your main protagonists do it in a way that they can't be expected to get out of, pluck or no.