The best feature of Motionbased prior to the move to Garmin Connect was dot racing. This allowed two rides to be played simultaneously in map view. If playing two rides from the same course, you could easily see your relative performance on each section of the ride.
And how about colouring the route track in the map view according to selectable criteria? Like speed, pace, gradient, cadence etc? FOr example, if you colour the track according to speed, the track would be coloured from red to green to quickly show relative speed over the course. Just like Nike+ does.