Guinness 250

I tasted the 250 from Guiness today.  Quite the odd beer.  The barkeeps were not enthused by it at all and I can see why.  It is the regular stout that is watered down with Irish spring water.  It is not bad at all.  But it does have a more carbonated/soda-esque taste to it.  With a nitro tap it might be even more pronounced.  Either way, I am not sure if it is a marketing ploy.