I have to say that I have only watched season 1, and then watched the odd episode off season 2.
In New Zealand, Series 1 and 2 got a good timeslot so I watched those 2 seasons completely. But season 3 didnt, so I never ended up watching it half the time. I guess it didnt get good enough ratings second time round and they dropped it into a later timeslot.
Season 1 was great, I loved the presence of Sly and of course Sugar Ray on the show, they really know what theyre on about and I just loved them.
Also each and every fighter made the show more interesting, some more than others, like the "big talkers", but each of them was great.