Having spent significant time in cities with roundabouts, I've grown accustomed to them and appreciate not having to idle at a stoplight. As I understand from reputable statistical sources, roundabouts are generally safer than intersections due to lower collision speeds and the far-lower risk of head-on collisions.
That said, I don't believe that roundabouts are appropriate in certain areas, and if used, they should be kept as simple as possible (multiple outlets like we have at University & Boulder are just confusing). And as we build them, we ought to keep the center circle as simple as possible -- large obstructions or complex landscaping are a needles (and expensive) distraction.