Lui is sh*t. The worst half I've seen.
Defensively he is just pointless, stands flat footed, which is a very bad thing for any defender to do, let alone someone as short as he is. He grabs at arms or shoulders, he doesn't lead with his shoulder in tackles. He approaches from the side, grabbing and flat footed, meaning he gets brushed aside all too easily.
In attack, he again offers little. He only has one purpose, he passes the ball to Benji, who can play at second receiver and have some more room. That's all he does.
His movement is slow and predictable. He has no acceleration or speed. He doesn't run at the line with any purpose.
He really is a sh*t player in every aspect. I'd even take Joe Williams over him. That's how bad he is.