Cisco ACI. What a janky, buggy mess. Dozens of clicks to accomplish tasks you used to be able to do in less than 5 seconds from the CLI. And the GUI is laid out like a fever dream. You need to script everything to be even close to efficient, even unique one off tasks, and then you spend more time editing scripts than it used to take to do jobs manually from the CLI. We have one environment with a couple hundred independently managed switches that one guy can manage pretty effectively with little to no automation. It takes a dozen people to manage an environment with about three hundred switches and they are always fixing stupid bugs. The staff turnover there is hilarious. Most people try it for a while and then run for the hills.