My first season at Leeds he scored 31 goals despite various injuries (he only played about half of the games). He's captain of the U21 England team, considered for the senior squad of England and by the start of season 2 teams like Liverpool, Barca and Inter are knocking on my door with 4+ million offers.
Apparently my custom training for him worked well ( also lots of tactics at times when he was only in light training after injuries worked wonders), and some old but good geezers on loan to tutor him were not wasted either.
My last Leeds game he didn't perform as well as that, so I guess you need a bit of luck with the starting values, but for me he's a key player in that save.