I experienced a lot of stuff I didn't really notice how bad they were until I was off of them. Anhedonia, apathy, lack of volition, and sexual side effects. I also have trouble remembering parts of my life when I was on SSRIs.
I don't regret trying or even taking them for extended periods. They make the bad thoughts go away and raised the floor for my mood. But they also put a pretty low ceiling on it, too. I was probably on them for too long but clearly medicine doesn't have a perfect framework for handling every corner of this space, so I don't really blame anyone. There's a goldilocks zone for drug, dosage, and treatment length and I don't think I was always in it.
I've talked to many people who have bad things to say about SSRIs. On the other hand, my girlfriend is on one right now and seems very satisfied.