In the right direction, but...
...my current car has a range on a full tank about 450 miles, but I seldom do much more than 350 miles before filling up. We all like to have a margin of safety.
Given the longer "fill up" times of battery cars you would probably want to give yourself a bigger margin. In the case of my car we're looking at my having something like 2.5 gallons left from a 12 gallon tank when I refill. So lets call that a 20% margin of safety. So a realistic range for the Leaf would be something under 160 miles. Not so hot.
Bear in mind that I'm a fairly normal driver in as much as I park on street at work and on street at home. So charging a battery fuelled car would be problematic.
So kudos to Nissan for doing something about the limitation of battery tech, but there's a long way to go yet. This is why fuel cells (not necessarily hyrdrogen) are such an attractive idea, refuelling will be much easier.