The video claims roundabouts reduce accidents but according to the experience here: http://www.regionofwaterloo.ca/en/gettingAround/Roundabout-S... collisions involving injury or fatalities did decrease by 51% at intersections that were replaced by roundabouts; however, overall collisions at those intersections increased by 35%.
It's getting better, but now the lack of roundabout knowledge can be exploited to travel much faster. So many people wait in the left lane when going straight through, leaving the right lane free to breeze though.
I do think the non standard roundabouts have become more dangerous now that people are more familiar with the "typical" layout found on ira needles. I was travelling north (or east in the parlance of this crazy city) on Bridge St this weekend. I had just crossed the grand and entered the roundabout intending to take the 3rd exit for Lancaster (left turn). This roundabout is odd due to the lane markings. I was well into the roundabout and had the right of way when a bus entered travelling south (west) on Bridge to turn right on Lancaster. We nearly collided (and if we had it would have certainly been the bus' fault) but I was able to brake in time. I am certain the slightly bizarre layout of this roundabout made it look like I was going to continue on Bridge and therefore it was safe for the bus to enter. I live in this area and this has not been an isolated encounter. The roads all have a single lane entering the roundabout but a special lane appears in the roundabout for taking the 3rd exit for Lancaster. This was likely done to increase traffic flow but results in real confusion for people entering from Bridge the other way. It would likely be much easier if there was just a single lane all the way through the roundabout (like Margaret&Union) so it was clear there isn't room for multiple vehicles in the roundabout at the same time.