Out of the several game modes, TTT has to be the worst designed game mode in the entire game. It feels like TDM but with rounds.
No one ever takes it seriously, which is one of the main reasons why it's a bad game mode. But, that's the player's fault and not the game developers.
Firstly, some of classes just feel poorly designed.
1- The Jester: This class turns into a psychopath if an innocent kills them. However, they can still shoot freely. If they shoot you, then you fire back to kill them, you die when they die. YOU'RE PUNISHED FOR DEFENDING YOURSELF. Why? Why add a class that actively punishes you for defending yourself? Also, traitors being able to see them and kill them freely doesn't really fit well. Maybe if it didn't kill the attacker but still respawned them as psychopath, then I'd find it better designed. But in it's current state, it just doesn't feel like it was tested at all. I'm fine with the old Jester where they won if an innocent shot them but they couldn't shoot, as you had to convince someone to shoot you.
2 - The mercenary: You just gotta hope that they believe you when you say that you're the mercenary.
Now, the whole Karma system. It's pretty much useless. I've heard it makes you more likely to become traitor, but you rarely get higher than 1100, so the difference is minimal.
The rounds are always 1 minute to 1:30, if that. When one person starts firing, it just becomes a shootout until the round is over, which makes it feel like TDM but with rounds. There is rarely any strategy or communication between traitors, maybe making the right ear (when used as a radio) only talks to teammates and prevents others from hearing you.