No one will know how well hybrids will work in the field until they actually get some in the field and rack up some empirical evidence. For urban, stop & go traffic, long periods of idling, or whatever hybrids do when standing still, they may work out just fine. I'd think they could be ideal detective and admin cars. For a car to be a "good" urban car, it needs to be able to take a beating, performance is secondary to endurance.
Until Tesla makes a cruiser, i doubt there will be alternative energy highway or rural patrol cars given their limited top end, but actually, for droning down the Interstate, they could work well there, too.