He's not as bad as his brother, being able to find the net puts him ahead. Having said that, I don't see what others see in him other than what he's done before he came here.
Was at a PSV game last season, guy I was talking to about them said Luuk was the better and more technically gifted of the two. Alarm bells ringing when I heard that.
Willing to give him a chance this season, but I haven't been impressed so far and I would not play him ahead of Perez (they both should play, considering options, tbh).