Since other people have done an excellent job pointing out the build's weaknesses, I'd just like to add that you should let the player do his thing sometimes. He built the character that way because he wants to be this big brick wall that enemies can't touch, so have enemies (especially one or two individuals in a group) sometimes try to beat him up, even if (even though) it doesn't make tactical sense for them. Basically, don't shut this guy down all the time just because it's easy to do so. That only leads to frustration.