I believe that wikipedia is a very useful resource as long as the information is guarded. Even if the information is considered a tertiary source. As long as the information is accurate there should be no reason why it can't be used. For example I can give you some first hand information about me, but it would also be very biased. However, if a source still gives out the truth, it is considered suspicious if it is not peer reviewed. This is just something that I find interesting.