You would understand perfectly why people hate those screens if you read the posts that have been made in this thread.
They are shit because they devote the majority of the space to irrelevant news, and you can't see when your next train is coming, which is what you want to see as a passenger. If you are at one end of the platform or the other, you need to walk halfway across just to be able to see this information. This is not always easy, particularly if the platform is crowded at rush hour, or if you have mobility challenges, and having to walk further along the platform is just salt in the wound, all because the enlightened "thinkers" at the TTC think that the important thing for commuters waiting at their train station to know is that somewhere, someone, committed a heinous crime.
That is why they are shit. I do not know how I can make this any clearer.