I think Junkrat's way worse. Every single skill he has is annoying.
Standard bombs that kill you randomly while he's in a safe spot, mine that can be set up as a trap (with basically invisible traps) or to get away from a close enemy immediately, can reach high places thanks to that as well and without taking damage. Even when you kill him he drops bombs on the ground.
I agree about his death bombs, he really doesn't need those. But Mei is on a whole other level of annoying. She exists just to be a big middle finger to the apposing team. Her gun has a near instant freeze and that doesn't just slow down your movement speed but also your aiming. Which means if you get even slightly frozen by a Mei you just have to accept that your dead. There is little to no time to react and retaliate against her freeze ray. Also, why does her icicle have to be pinpoint accurate? I'v seen good Meis be pretty effective at counter-sniping.
Her Ice Walls are the literal worst on control maps like Hanamura were there is only the friggen' choke point for the team to go through. I had a game yesterday were a pair of Meis perfectly timed their ice walls so that the front gate of Hanamura
ALWAYS had a ice wall blocking it. So the only entrance we could go through was the little hole on the upper left. Which is utter bullshit. It doesn't help that half the time when ever someone is playing on your team they're just playing her to troll the team with ice walls that trap you with the enemy or block the spawn room door.
Her Cryo-freeze is that thing that annoys me the most. It has zero start up. Has frame advantage against everything in the game, and give her full health is seconds.
WWWHHHHYYY.
Every time she uses it turns into at least one or two team mates have to sit and watch her go through the whole animation just to try and kill her again. Also, she doesn't need 200hp. She just doesn't. Not when her Cryo-freeze can heal her to full (and negates all damage) every twelve seconds.
Its also kinda BS that her ult is actually bigger than it looks.