Hurricane-class battlecruiser from EVE Online. You do not, and never will, fuck with a 'Cane fleet.
"The force with which this ship hits is more than sufficient to leave a trail of shattered enemies, floating around like so much lifeless debris. An adaptable vessel, it has enough turret hardpoints for a full-scale assault while remaining versatile enough to allow for plenty of missile fire, and has both sufficient speed to outrun its enemies and sufficient capacitor charge to outlast them."
I don't use a Hurricane anymore because I'm into a Legion now, but you can change Tech 3 ships to work differently so they don't count in quite the same way.
Runner-up is the DA-SR 12 from FTL. It's a nasty, vicious little ship with basically an instant death laser. Once you get some new weapons (missiles or ion bombs to kill shields) you can easily kill anything with no risk because of the 25 second cloak, especially with leveled gunnery operator.