I think that this is a great use of color and boldness for a logo. First, the colors are not normally seen as logos since they are not primary colors. The boldness of the word creates both a wordmark and logo in one. This is a good logo because when you see these two bold colors in blocks next to eachother, you automatically think of fedex.
I think that this is a poor logo. It is too predictable and doesnt put in any creativity. Also, the color green in not bold enough. Underneath the words are not as clear as well.