Is the central theme of Morte d’Arthur consequences of greed?

Answer 1

I am not sure whether you are talking about the poem or the legend. Here are some links related to both.
http://en.wikipedia.org/wiki/Le_Morte_d'Arthur

http://www.sparknotes.com/poetry/tennyson/section6.rhtml

http://www.eliteskills.com/c/3083