There's a roundabout near me that is medium sized with no view cross it, sometimes people driver round it quickly (probably within the speed limit) but not safely bearing in mind the view of others waiting to pull out. I've been caught by this but don't feel too bad as it's their own making.
I think roundabouts like this must be all over the place. There is one in the village that I live in (in fact the only roundabout in the village). On two of the entrances there is a view to right but not the left. On the other two entrnces the view to the right is restricted. Drivers enter with no thought for others entering on their left. I have experienced this many times. You just have to pace it right to either get ahead (if already on the roundabout) or stop (if just entering) and have your eyes everywhere!
As to considering others entering roundabouts - it is not just restricted view roundabouts but larger roundabouts where speeds can be higher. This can make them difficult to enter for many.