Everything we know so far about Dubai Metro's underground Blue Line
Sorry I stated that incorrectly, 800 meters to a public transport station. The bus picking you up to the stations does stop every few hundred meters at the different bus stops (from the parts that I have seen). There is also an app so you can follow the bus to your pick up spot so you don't have to burn in the heat waiting during summer and only exit your building once they are close. I haven't taken the RTA busses, but it works with the same card as the train, but I can't say how good it is.
Also remember the London underground has more than a hundred years on this Metro system. It doesn't cover nearly as much. I don't know how much the RTA busses cover. I have never needed to go to the parts that the Metro doesn't cover.
I have only recently gone to Dubai Creek and the traffic in and out of there was really bad. I think they are targeting the highest chance of ridership first. I think the people going towards Sharjah is probably going to be the most numerous.
Personally I am more interested in the parallel line to Al Maktuom Airport, but I guess the ridership will be too little now.