Rob has a good evaluation post up about the slow going Health Line BRT in Cleveland. Ultimately the planners weren't thinking of Rapid Transit and probably had too many people to please when they decided to have so many stops on the dedicated ROW. But this isn't just an issue that keeps BRT below 10 miles per hour, the T Third line in San Francisco has a similar issue. It has its own ROW down the center of Third Street, yet it has so many stops and crossings that the schedule maxes out at 12 miles per hour. Compare this to Rob's example of the Red line in Cleveland that goes 25 mph.
But its a balancing act of serving the most people possible and making the line go fast. For example the FTA sometimes goes to far and the running joke is that the cost effectiveness rating would be a great measure if you didn't have to have stations on the line. But something we might think about when planning these lines is that perhaps we don't need stops so close, and also that signal priority for buses and trains is imporant in making these generally longer haul services competitive with auto trips.