I don't think that Little Rock is absolutely the worst, but its below mediocre.
Steep hills, narrow potholed streets and drivers who have no clue that a bicycle actually belongs on the highway and have no hesitation in saying so make it pretty daunting.
I hear a lot of people criticising Florida, and since I cut my teeth riding on Florida roads,(yes I still had baby teeth when I tackled Highway 41 the Tamiami Trail) that was kind of my standard for bicycling conditions. Little Rock is right about there, but hillier. It makes La Quinta seem like heaven.