Like why constantly banned?

im probably playing him wrong but I dont understand

His ult has a long cast range and large aoe, so he counters a lot of channeling and helps initiation with a 1 sec full team stun practically if used right.
Another reason he is good is the fact that he is TANKY with a good team in which you cast your demagicarmor spell that gives you hp if the target(s) you cast it on takes dmg and wehn you're team pounds on their team while they pound on you, your HP bounces back and forth fast.
His level 1 spell does high damage and he has a good attack animation along with good damage making him a good at harassing and last hitting/deny.

Cheers
-JaySongs

i also like that you can carry a game with him easy

He's not a carry though, you can only carry with him in low level pubs.
if you are over farming to carry then play style is definitely wrong in higher level gameplay, just saying, no offense (:

Cheers
-JaySongs

non taken it also depends on what team you got and opposing team and if you build right it's not hard:p but i normaly go for suport when i play him.

he hits stupid hard, and i love codex on him in pub stomps XDDD

Codex is a fun pub build hehe, it's like a HEAL and a NUKE! Pure damage nuke haha with the demagic armor on.

Cheers
-JaySongs

#1 he can straight up solo any hero ( during laning phase )
#2 his ultimate got insane cast range + is instant + if your teamfight was successful it will allows you to pretty easily push a tower and not to mention it's an awesome initiate/counter initiate/followup
#3 can decently solo longlane
#4 a good lifevoid can fuck up enemys teamfight completely not to mention it allows you to be quite tanky

Best ultimate in da game! Can deny all channeling ultimate even with magic immunity!

You can carry 1800 rating pubs as him if played correctly
BUT only against certain teams and yeah, everything is situational, so there are no right and wrong arguments in this kind of case.