I've only messed around with Xerath one time and I do admit I immediately saw a jerky support with some CC and harass but he's just so uninspired. His Q is now almost exactly like Varus's Piercing Arrow except there's still a a delay after you charge it up. It felt really awkward to use. His E is the standard Morg/Lux style CC skillshot. It's probably even the exact same size and speed as Morg's binding. His ult is three uses of Kogmaw's ult but at a hilarious range. Xerath used to have unique game play and now he doesn't. I don't see how it took this long to do a rework when all his abilities are templated from existing characters.
For now I choose the sidelines until things change around. It's just disappointing to know that it is probably going to be a month until Doran's Shield gets nerfed at all and even then it probably won't do much and it'll then take another six weeks after that for something else to happen bot. I don't think it's very likely to see Leona and Thresh climb to the top of the bans with how ridiculous Elise, Lee Sin, Kha'zix, and Vi are for junglers, how many fat assholes people don't like to deal with top, and then other disliked mid laners such as Gragas, Yasuo, Kassadin and Ziggs. The last time I banned supports everyone on my team thought I was nuts.
But hey, crippling Jinx nerfs on the PBE. Because it's Jinx's fault and totally not the fault of Leona or Thresh. I look forward to seeing nerfs to Lucian and Caitlyn before Leona even gets on the radar.