Quoting something I posted a while back.
[{quoted}](name=Lord Dusteon,realm=NA,application-id=3ErqAdtq,discussion-id=6yX7PK2F,comment-id=00060000,timestamp=2015-04-12T02:29:03.533+0000)
...how was Sion 'fucked up'? His lore screamed 'Juggernaut' but his best builds were pure AP (WHY THE FUCK IS THE VICIOUSLY STRONG AND POWERFUL JUGGERNAUT BUILDING LIKE A MAGE AND SHOOTING EYE BEAMS?) or pure AD. Additionally, his gameplay was EXTREMELY binary; as AP he walked up with W, Q'd you, then burst W and walked away. You had no way to counter him outside of never being in range, and Sion was basically useless past 15 minutes or if his opponent bought any MR item. As AD, he literally farmed for 40+ minutes, then waddled into range and autoattack drain tanked and hoped he lived. He had almost no active skills as AD (Shield was useless, stun was only for getting in range, and E+R were both passive effects that buffed his autoattacks) and his entire damage was useless if you had any form of peel. He was a horribly unfocused kit that did not ever satisfy what his lore promised.
Sure, new Sion is extremely different. He's also not a shitty 2 button kit that is either useless past 15 or useless until 40.
As a side note, have you actually tried full AD Sion? Tank Sion with 1-2 damage items? His damage is amazing if you can land Q or R (and if you can't land Q, just point blank R someone, then land it), and even as a full tank he has great damage.