Is a train every 15 minutes really that infrequent?
I would imagine that is right about where other cities are with light rail, no?
When you consider that the lines come together downtown at staggered times, there is a train through downtown every 7 minutes. Not bad if you ask me.
Here's a new map of the system for those who are interested:
The red and blue lines are existing light rail, the purple is the new commuter rail line, and the rest are in various stages of planning and construction. The plan is to have them all finished by 2015:
http://www.rideuta.com/projects/fron.../overview.aspx