The only beers I said that I thought tasted watered down were light beers. I can tolerate most regular beers, although the ones which I listed have a little more flavor and fullness to them than the standard budweiser or miller or something. I noticed you mentioned guiness...I also like guiness once in a while.
I guess it's all down to taste, or social culture...
Honestly, I'd tend to drink a beer like coors only if I'd drunk far too much...
In fact when I once walked into a pub in britain ordering a bottle of coors the bar tender correctly guessed that I was very drunk... even though I'd had my friends go to the bar for me, and hadn't said a word and the bar tender hadn't seen me...
he just knew that only people who were unbiolievably drunk would drink weak beers...
(it was a locla pub for local people kind of place as well that didn't really help matters either!)...
Rolling Rock isn't so bad though...
the only trouble that I have with it is that it only seems to come in bottles, so I spend far too muck time waiting at the bar...