If you're wondering about trying Murphy's because you liked Guinness so much ... don't bother.
Basically, to make 2 pints of Murphy's, start with 1 pint of Real Stout. Seperate it evenly into 2 pint glasses. Then add half a pint of water to each glass.
You have now recreated the genuine taste of Murphy's Irish Stout.
That said, if it's all that's available it's a lot better than all those American beers which seem to be so popular.