Sion is god and don't let anyone tell you differently.

Pros
-You are god
-Dominate squishies with a full q from a bush then a charged w and e with the thunderlord proc
-Satisfying as f-frick c;
Cons
-Hard to kill most tanks, but the squishies going against you will get a warmogs because sion
-Darius

When getting blue, red, or crugs, stand in the pit to the right or left side (for crugs always on the side with the bigger crug) get a max q, then aa and get the chain cc hitting the large creep to the wall with e and stunning it. For birds align your q with all the little birds while having your w charging and let go the q and release the w at the same time and get all the small birds.

My main strategy is having a friend play darius top and when you get ult, come top and gank him usually ending in a kill, then stay there until you get to the inhib because at that time, your ad should be about 200 because of warrior and hydra if you get a few kills from the other lanes. After pushing top, you should rotate to the other lanes with darius and keep pushing, go to the lanes with less enemy champs for easier push. Your ult is kind of hard to land in teamfights, so just ult to aim for the fed person, and being stupid, the enemy team usually all jump infront of their carry trying to protect them, but instead get 4 man knockup. After the 4 man knockup imeadiately charge q and w and release them at the same time, doing insane dmg. Or if they have a darius, you get pentadunked. I hate darius when he isn't on our team