What you gain by adding Hezbollah is a much more disciplined force. They probably have the best trained, best led light to medium infantry in the Arab world. The equipment may not be much different but they will use it to its limits, which is true of virtually no other Arab army.
Would that stop a competently led American or Israeli combined arms team from rolling over them? No, but it would be considerably more expensive than grinding up and spitting out the same number of troops from virtually anywhere else in the Arab world. And trust me, this is coming from someone who would not lose one minutes sleep if the U.S. and/or Israel did just that. But underestimating the opposition is how you get the important bits chewed off. Hezbolla is dangerous, Oren may have easier acces to many of the details if he is reading this thread.