Not only has he had no success - he actually makes things exponentially worse! He's not an angel of death - he's a DEMON of death!
Kerry has been
very successful. You need to keep in mind that what he and the regime consider "success" is not what you or I would consider "success" to be. Their aim is to weaken Israel, further marginalize the state and stoke more hatred against them, and totally isolate them as pariahs.
Once that is sufficiently accomplished, you will see of one the primary reasons for the so called "Right To Protect (R2P)" doctrine come into play. Again, these people play for keeps.