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The throughput on roundabouts is crazy high.

Fender benders may be up a bit, but I'm skeptical of that based on MnDOT/State Patrol's crash data.  YMMV based on your jurisdiction. However, serious injury wrecks and fatals (which are almost always high-speed T-bones) have disappeared. A merging collision below 20 MPH in which both cars are going roughly the same direction is a much more acceptable outcome.
The biggest thing I've noticed that is way up re: roundabouts is bellyaching about roundabouts from truck drivers with trailers who don't know how to drive their load.

We've got a standard 4-way stop light right near my house that is HORRIBLY dangerous.

Somehow all four directions are downhill approaching the intersection. 3 lanes each way one direciton, 2 lanes each way the other. Double left turn lanes at all four directions.

Seems to be a collision here near daily, and there have been some VERY nasty ones too.

When going down Alicia from my house, I no longer stay in the right hand lane because people stopping to get into and out of the Arco gas station causes a lot of fender benders; I've actually been rear-ended there before when I had to slow down because people were entering the gas station and the guy behind me didn't notice.

I don't know what makes this one so prone to major accidents except maybe that everything is downhill, but I get nervous every time I approach this intersection--which is bad because my typical routes have me using it VERY frequently.

Yeah that intersection definitely looks like it sucks.  I'd probably go far out of my way to avoid it. 

Based on the lane layouts, sheer volume is one of the reasons for this being a problematic intersection.

You mentioned all of the approaches are downhill? That contributes. It's harder to stop.

Interesting.

From my anecdotal experience I thought that crashes were UP because I see plenty of fender-benders.

I assumed that ODOT simply accepted that because the severity of crashes is WAY down because instead of deadly 50 MPH T-Bone crashes you are seeing ~30 MPH merger sideswipes which are highly unlikely to be fatal.

I'd just be happy with drivers making driving their main focus while driving.