Those who are criticial of hamza yusuf are not jealous of his arabic. Have you ever wondered why shaykh nuh keller does not face the same criticism that hamza yusuf gets. Hamza Yusuf is very knowledeable, has done loads for deen etc but there is no doubt that he has said some wrong things...a good example. An imam told me in the harmain sharif that shaykh hamza yusuf told him after 9/11 to shave his beard off as he was creating fitna. This is just 1 example out of many that I can give you. On the other hand shaykh hamza yusuf has some really good lectures on the education system, food of the prophet sallahuwaslaam...purification of the heart etc. His taweel of some of the signs of the day of judgement in a lecture which he gave some time prior to 9/11 was criticized by many scholars as well. He is without doubt a sincere person, has knowledge and effects the masses but at the same time there are many clear mistakes in his discourses. He is also the proponent of minority fiqh with his teacher shaykh abdullah bin bayyah...The approach has been well critiqued by shaykh nuh keller. Another point to consider about shaykh hamza yusuf is that many times he gives very vague remarks due to the position that he is in. For example he will say something but not mean it. When some people in london were once criticizing him for some remarks he stated that 'war is deception'. He uses this tactic a lot when dealing with the media, harsh american audiences etc....