PBR is a solid, solid beer. I'll drink it as soon as I'd drink any import.
Having said that, the best beer I've ever had is Caffrey's, an Irish cream ale. Unfortunately they stopped distributing it in the U.S. so others must not have agreed with my opinion.
Wheat beers rock, Negra Modello is awesome, Foster's Bitter is very tasty, regular Foster's is horrible, most American beers are serviceable (except Natty Light and the Beast family of beers), and Newcastle is my fallback beer when nothing else looks good.
I have to agree with the PBR. I think it is a good beer. Very underrated, IMO. I just had one recently. It was out of a iced cooler so it was really cold and it was in a bottle not a can. I was surprised how good it tasted.