I disagree, if he had nothing else going for him he wouldn't have been valued by Liverpool, the Dutch National Team, Feyenoord, Fenerbache.
The way some speak about him make it sound like he played for the Bournemouths, Villareal's and Schalkes of this world. He didn't. So managers must have seen something in him, people like you don't.
A lot of people disregard him for his looks and his clumsy style, but he has been of undeniable value for the teams he has played. I am an Arsenal and Ajax supporter, but I am first to admit that he has much more going for him than just hard work.