Xerath is easy to dominate if you know how to dodge his abilities, for example, Ziggs is my main (I recommend him, superior map control and absurd range, what's not to love?), and I consider it worth it to pop a W the very instant he uses his E, that way I jump away from his followup, even if he has a Rylai's...
Viktor is quite fun also, but he REALLY falls off late-game, and can't do ANYTHING except his ult...
Viktor is better played as an aura support offtank mid, if you really want to play him...
his role as an AP Carry isn't very good, in my opinion...
Maokai is very hard to use, and if you don't know how to use him you fall off late-game...
but if you farm enough and maintain a strong presence, you will be unstoppable...
Sejuani is just silly...
she's kinda like Amumu, but in my opinion, better, as you really can't escape from her once she gets in auto-attack range, unlike with Amumu, who has to have his ult to keep you in place...
Once Sejuani has her ult, she can crush lanes like a grape...
Ziggs is my favorite champ, and of course I'm going to be biased towards him...
his damage gets quite insane with only a little bit of farm, and with practice (muahaha, hours and hours and hours) you can hit people who are sitting under tower with your Q from the middle of midlane...
his W has some weird glitches, and is an astonishingly good escape tool...
For example, I leave mid after killing their Veigar to go help top, I get behind their tower in the grass (they were blue and I was purple) and get set up to "dive" their Garen (Ziggs can do that without getting in tower range) my team rushes in, and lo and behold, Jungle Xin AND nasty nasty Veigar come rushing towards my little patch of grass...
I had burned my flash earlier to escape Xin's gank, so I quickly set up a W to pop over the wall, but I misclick, and fire myself towards the tower instead of towards the river...
but
it glitched
and I flew an obnoxious distance (from that patch of grass all the way over that giant corner to the furthermost edge of the river) and escaped this absolute death...
I've tried to replicate it, but I've only hit the wall and slid down... How strange...
Anyways, Ziggs' E has a variety of uses, if you are worried about a jungler, you set bombs in the bushes and listen for explosions...
if their mid commits to a fight, you laugh and drop the whole set of mines on their head and a Q...
The mines will do FAR more than the Q will do, even if the mines are a lower level than your Q, just make sure that you don't put a W on them or the mines won't be as effective...
I've had Vaynes and other silly mids try to commit to a fight that they think that they'll win, and when I am able to land a full burst, they die almost instantly...
Ziggs ult
the silliest thing ever
has range from the center of mid to Baron AND Dragon
has absurd damage
has a surprise factor, they see the skull and they know in that split second, that it was pure foolishness to suppose that they would have escaped...
MUAHAHA
anyhow, I save my ults for when I have to B and my lane is being pushed hard, I just pop it and demolish the wave...
I save them for when someone overcommits and I need the massive burst.
I save them for when a gank is happening so I get the kill or the assist
I save them for buff steals and baron or Dragon steals (takes skill to steal em, I've done only two dragon steals to date and no Baron steals...)
Ziggs is a blast (pun intended)