If you're hiring smart people and they get into your company and find no way of succeeding, that's because your company sucks, not your hiring. This person isn't complaining that the job is to make people click on facebook ads, they're complaining because the company is so badly organised that 90% of the time is wasted not even on doing the job.
But there's literally nothing to indicate this person isn't smart. There's evidence that they are smart- they passed the interview, which let's face it, might not be perfect but certainly requires some level of intelligence. There's nothing int he Op post that indicates they're not capable of doing good work, only that they're in a situation where they and their colleagues aren't.
I knew a very smart guy who even won some competitions and such.
He never found a company or position where he would be productive. He was "demotivated" in multiple companies (I met his former colleges from other companies who confirmed and seen him in multiple teams).
