The basic work can be repetitive and is very metric based with an emphasis on speedy and accurate logical reasoning. There will be pressure to perform. Doing it well is difficult and requires skilled mastery of many tools, ability to research and in general is very challenging considering the level of seniority and compensation is not particularly high. Much less intelligence is required for many higher paying jobs. Basically they are expecting Sherlock Holmes on a fairly moderate salary. If you enjoy logic and deduction, ( I personally even in my spare time enjoy reading detective stories and reading what's going on with scams and cybercrime stuff) this can be a positive thing. For people who don't enjoy or are not talented at that, it can be stressful and feel unfair when you make a mistake.