I am killing it on Xerath, I had a 13/3/2 game where I held mid against two opponents by myself with him. Great range, the combo, of setting up a stun and then 3 arcane blasts, almost an I win button. :-)
Hmmm. interesting arguement sir. Would you mind telling all of us exactly WHY he is " the worst"? Whenever i play Xerath, i can completely destry the other mid. But, i understand that Xerath can be a little difficult to learn. Its not easy landing all of those high mana, low cooldown, skillshots. That takes a toll on your mana early game. meaning you cant build as much damage as you'd like to. But late game... late game is bliss. Firing off 500 damage skillshots on the whole enemy team from a mile away, ever 3.2 seconds. Plus the ultimate is incredible for teamfights as well. In short, practice makes perfect, and remember how amazing your abilities are in teamfights and you'll be k.
And for most part.Xerath has better than "average" scalings for his spells. combined with his range. he's one of the safest mages late game. and is surprisingly tanky against a meddlesome bruiser than would somehow manage to get close to his thanks to his Ascended Form. And the Movement Speed from Locus of Power is useable to escape since you're most likely to be using already so you can easily de-activate it without trouble. ( the reason you don't use Locus to escape is obviously it's cast time but since you've already long casted it, it's useable )