The reason I play on noble and normal speed is first of all because of consistency with our pitboss , but noble also because you can't really lose and it's easier to compare also the weaker civs (while dead is dead), and normal speed also because I want to play with as many civs as possible - I don't know whether I'll make it to play them all before I get fed up with it or Civ5 comes out
- and with normal speed is simply goes faster. But I have to agree domination is very hard to obtain.