User blog comment:Bashfrog/Sion Invisibility Syndrome/@comment-1990160-20130730012908

I believe that a rework is... in the works. That said, yes, I think he sucks. His design is "unkillable zombie tank", but his innate is nearly impossible to notice, and his Q/W lend themselves to AP builds, which is insane and has... well, no counterplay really.

However, if you choose the other path, of the AD carry, he can stomp with just Ravenous Hydra, which builds with his E. Also, theoretically infinite health stacking is a bad mechanic (but means that he is possibly the only champion that Atma's is viable on after Atmog's fell out of the meta oh-so-long ago).

Also, he feels incredibly slow (admittedly, as a zombie should be), but his mana costs are too damn high (100 mana for Q/W when his mana is 200 + 40xlvl). Sion is designed weirdly, a relic of a League past, and is overdue for a rework.