Funny you should say that, when I was a child we were brought up on American offerings like Laurel & Hardy, Bugs Bunny, Popeye the Sailor, The 'Cisco Kid etc. etc. Then there were feature films like Casablanca and The Big Sleep with Robert Mitchum. We heard American accents from wall to wall, and to my mind the dialogue in our English offerings wasn't half as snappy as in the American ones. Furthermore, English gangsters like Richard Attenborough as Pinky in Brighton Rock for example weren't anywhere near as convincing as James Cagney or Edward G Robinson. As I've grown older I've learned to love a bit of received pronunciation, but as a young kid it sounded, well, lame.