The monitor takes a HUGE beating. I have come across a couple in fights recently, and they just refuse to die. they are the perfect escort vessel, I would go as far to say that two monitors could keep any ship safe.
Strangely enough, i have noticed that the AI will put itself between your fire and a dying ally in attempts to save it from certain doom. multiple times when an allied cruiser is overheated, a wolf or lasher flies straight in and unloads everything they have at me in order to stop my attack. most of the time the frigate dies, but if it were a monitor... that would be a different story. really liking the updated AI this update, but having all maxed out officers makes fights a bit too easy.