Dallas is, in my view, the greatest U.S drama series/soap of all time, but even amongst it's fans there are differing views on when it wasn't during it's 14 year run - and we've debated that at great length over the years.
However, party of the huge global success of Dallas wasn't even planned - The who shot J.R plot reached fever pitch because of a longer break between series and because of Larry holding out for a pay increase, it created a perfect storm. Likewise, the sad death of Jim Davis led to one of the biggest plots of the series, which then spider webbed into so many other stories and plots.
There were downsides though, after the massive success of Bobby's death the show became a laughing stock with Pam's dream....BUT people remember it, they still talk about it - even casual fans always bring it up when Dallas is mentioned, so although it was ridiculed at the time, people talk kind of affectionately about it now.
Miss Ellie's changing head was the other one, but really, only fans remember that.
The last 3 seasons saw big changes, poor plots and some very unnecessary departures for me, but other fans of the show still enjoy it right through to the end, and everyone is entitled to their opinion.
Doctor Who will always be my all time favourite show, a show that can change it's lead actor, and be set anywhere in space and time...it's really is THE perfect premise for a show . But Dallas will always be my number 2, a show I have loved since I saw the very first episode and I watched it right to the bitter end on it's original run and can now re-watch every year or so and stop when I feel the quality dropped. Roll on the HD release box set...I WANT IT AND I WANT IT NOW!!!