There's not much to talk about his Boxes, you just have to put them down everywhere when they are off cooldown and you can put them through walls. Ignite is more for getting kills early on and its good for killing tanks.

Mundo isn't good reason to pick up ignite. :P I'd still prefer exhaust. I won't comment any other points of your guide, cause I am really not the best guy for that job. I like more about JackBoxing thought.