this is true, as is dealing with secondary gain and case managers who come to appointments and eff things up for you.
HOWEVER, I personally love work comp. It is greater than 50% of my patient volume, and by communicating well with both industry and with insurers, I am now the "company doc" at two industries in my town. That allows other revenue streams (fitness for duty, hearing/respiratory evals) for which the industry pays at the time of service (usually with a CC).
I agree with ampaphb that the learning curve is steep