Before the latest version of 0.65, Monitor could shield ram big ships to death, and shoot up small ships. Destroyers were its bane. They were not heavy enough to shield ram, and they were too beefy to kill quickly with flak and two small guns. The last time I tried to shield ram ships to death, it was much less damaging that it used to be, even against capitals.
Many skilled tier 3 or 4 ships can solo an unskilled capital or two in the simulator.