As near as I can tell, from personal experience and looking at the map, the East Village and Lower East Side (where I live) are the worst parts of Manhattan for balancing issues, before the expansion to the far Upper East and West Sides at least. In the high summer season, huge swaths, say from 4th Ave. east and 14th St. south, all the way to Chinatown, are devoid of bikes during the day, and completely dock-blocked at night. I give up even trying to use bike share on most weekdays in the summer.