Holy sh*t.
Like most new Record of Ragnorak fans, I was introduced to the series by a motion comic video on Youtube. It was the fight between Adam and Zeus. When I first watched the video, I thought "hm, this seems interesting." Little did I know that it would be one of my favourite mangas of all time.
Most of the fights so far have been a blast to read. Granted, the manga did start rather sloppily (Lu Bu vs Thor is my second least favourite fight), but it gets better over time. Give this manga a read if you enjoy tournament arcs.