So am I crazy or is He Yi low-key a combat monster?

I've played with him and against him in the campaign and in a few custom battles and I noticed that whenever He Yi gets into a duel or in a fight he always seems to do really well (if not quickly) I've had one custom battle where he routed Zheng Jiang, which shocked me. His stats seem mediocre at a glace so I can only surmise it's his animations or his buffs.