Stratis said:
Corona, Bud and Carlton Cold come to mind.......
Its a long time since I've tried bud so I cant comment on it.
I'd have to agree on the carlton cold though.
As for corona, I dont think I'd rate it as one of the worst beers I've had. If its drunk in very hot/humid weather, its quite refreshing (though tasteless with no palate

). Very inoffensive beer. I dont like it, and its overpriced crap, but its not what I'd consider to be a "terrible beer".
My terribles:
Tooheys Extra Dry (what the hell is this??? its sure not beer, all i know is it gave me a headache after 3/4 a bottle, and I can down a fair few strong ales)
Carlton Cold (this tastes like off hops and chemicals)
Carlton Draught (same as above, but more chems)
fiscus - As for crown, its marketed as a premium beer, so people beleive its a premium beer. Its amazing what marketing can do.