Beer sucks. Of course, the disclaimer here is that I've only tried shitty American beers like Natural Light (*puke*) and maybe Coors (however, I've had small doses of Rolling Rock, which I think is tolerable). Not only that, but my main goal in drinking alcohol, to get drunk, is rarely accomplished by drinking beer, which makes no sense considering how much of a lightweight I am.
Sam Adams is OK, Sierra Nevada is good, Rolling Rock is not bad, Pete's Wicked is alright... There are a few good American beers. And it depends how you drink them. Even something like Budweiser or Icehouse tastes pretty smooth off the tap.