I hate the person in TF2 who came up with the idea of random critical hits. No, mini-crits and critical hits are fine, if you earn them by doing a specific task. My favorite weapons, such as the Kritzreig, Sniper Rifle, Eyelander, Axetinguisher, and the Frontier Justice all are weapons that reward the player with playing well by giving you critical hits.
But random critical hits? There is literally NO other reason for them to exist BUT to screw some guy over who probably should not have died so fucking pathetically. It's the most chickenshit strategy for a newbie to get ahead over the advanced player, by sheer, bullshitted, 'of COURSE you got that' luck. You have better gear, skill, health, backup, and perception of the problem at hand, BUT YOU WILL FUCKING LOSE BECAUSE OF A 4% CHANCE THAT HAPPENS TO *YOU* AND ONLY *YOU*, AND IT WILL NEVER GO AWAY IN VANILLA SERVERS.
You have four heads on your Eyelander, you're running almost as fast as a Scout, you have more health than a Soldier, you have a shield granting damage resistance to the biggest hitters of damage, BUT THAT ONE SNIPER WILL HIT YOU *ONCE* WITH A CRITWACKA AND END IT
You fighting a Pyro and spamming flames? WHOOPS SON HIS FLAMETHROWER GOT A RANDOM CRIT FUCK YOU
You running around a corner from a Heavy? WELL HEY THERE, I'M JUST A CRIT BULLET THAT HE RANDOMLY GOT THAT IS GOING TO TRAVEL AROUND THE CORNER AND KILL YOU
Trying to melee that fucking Spy who OH HEY ONE CRIT BULLET THAT IS GOING TO SUCK DOWN AT THE MINIMUM HALF OF YOUR HEALTH
Fuck them. But the worst rage I've had is where I screamed myself hoarse (alone at home) and repeatedly bashed on my desk.