As title says, I believe that Sion is a thematic masterpiece gameplaywise and in a visual way too!
Sion is a Juggernaut/Tank hybrid that is mean to push toward enemies despite being wounded, shrugging off damage and be unstoppable force on the battlefields, well - as we are all aware that newer Sion players usually play like this, they actually go and fight people and over all have a fun time fighting people but older and more experienced Sion players usually result to the "inting Sion strategy" which essentially means that those guys will not stop until your towers will fall, they will continue destroying objectives only with end of the game which reflects a really cleaver and most likely unintentional thing that Riot has created in Sion - he as a champion and it's player base reflect the concept of fighting enemy that does not fear death, an enemy whom cannot be reasoned with or even be intimidated, most strategies people use to win lanes and push their lead is based on fear and knocking people down so they cannot fight back anymore meanwhile Sion even while defeated still can land a hit or two on towers so killing Sion over and over again is not a good way of beating him unlike fighting someone like Riven who can be quickly dispatched and heavily punished on stepping into a wrong direction.
Where I am trying to go with this whole post is that Sion's idea of being enemy that doesn't fear death but rather embraces it is very interesting even if it isn't healthy for the game.
Please tell me what do you thing about the topic, I am more then happy to have a talk about the subject.