Recently I was considering employment with Robert Half as a recruiter. I see what the other posters were talking about as it appears RHI is definitely a professionally run sweat shop for recruiting.
On the side of RHI i will say that they were honest with me in regards to what the job was like. Essentially they gave me every opportunity to back out if you will before making a decision. For that i was impressed with them. As it actually talked me out of the job.
I wasn't turned off by the selling aspect or pressure as much as I was turned off by the environment. Its just too crowded and jumbled. Not professional or conducive to a good working life. I can do the job but the work place would result in me quiting long before the job wore me out.