Arkansas is not an original, well developed or interesting movie. First, even the casting is good, acting is pretty weak. Second, movie's pace is extremely slow. So consequently it is difficult to be interested for almost 2 hours without getting bored. Lack of action does not help either.
Last, it could have been far better with just a more risky script. Looks like the director just copied several cliches from other movies. So, overall I do not recommend this movie.