As a non-Muslim I also have listened to some of Sheikh Hamza Yusuf's lectures and while his early lectures pre-9/11 I didn't always agree with, in his later lessons he seems to have redoubled his efforts to tackle very very deep questions about Islam and Western cultures. I believe he does so with great wisdom that is apparent even to non-Muslims.
I also recognize, as someone who has begun the long journey of studying Islam, that he bases his lectures very very carefully on Hadiths. What really impressed me however is that rather then simply spout out Hadiths in his lectures, he takes care most of the time to say whether the Hadith is a strong Hadith or whether the Hadith is a weak Hadith. However even the weak ones he will say sometimes are full of wisdom that bears paying attention to. I find him to be very moderate in his beliefs but very careful to explain why he is a moderate and why he believes that he is following the traditional form of Sunni Islam according to not only Hadiths, but what past scholars have ruled on the Hadiths from all of the Madhhabs. He also is very good at having dialog with Salafis and more conservative Muslims. He listens to them patiently and is able to both agree and disagree with them on matters and is always respectful. In the same manner he does not seem to always agree with Sufis either but likewise is respectful to everyone. That is why I see him as a moderate who is very careful and methodical in his reasoning and studies in Islam and the science of the Hadiths.
So for me personally he is someone who I believe offers great hope for Muslims in the West and who overall is a very very wise and well educated man. Thanks be to Allah we have wise Muslim leaders such as Sheikh Hamza Yusuf. May Allah give him strength and blessings in these tough times.