ROTK is one of the greatest novels of Chinese literature.
Though it can't be classified as wuxia fiction but if you're interested in wuxia fiction, you'll most likely love this novel too, because from the 14th century on, it has had an enormous effect on Chinese literature, including wuxia fiction.
In ROTK you can find great battles, great fighters, great masterminds, great leaders, great brotherhood, great loyalty...
Don't be hesitant anymore, just download the English translation of ROTK and enjoy it.
http://www.threekingdoms.com
(you can read English online text and download zip files of the English translation from this website)