I like roundabouts in countries where drivers grow up with them: the rules are simple and when everybody knows them, traffic flows smoothly. But in the USA, not enough drivers understand how they're supposed to behave at a roundabout and there hasn't been a concerted effort by government to get the word out on the rules of engagement (sic). The result is mass confusion and then you get people throwing up their hands and complaining about how they hate roundabouts.
So, as a public service, here are the rules: 1) when entering a roundabout you must yield the right of way to any vehicle present in the roundabout; 2) once in the roundabout, use your turn signal ONLY to indicate your intention to leave the roundabout at the next exit.
The beauty of a roundabout when compared to a four-way stop is that there is no ambiguity in Rule 1: a vehicle established in the roundabout always has the right of way, either to continue or to exit, over a vehicle approaching the roundabout. There is never a question as to who was there first, as there inevitably is at a four-way stop...and you don't have to solve the conundrum of the 'rolling stop', or the 'dance to the scene of the accident' you often get when two drivers both assume they have the right of way to proceed through the intersection.