Yep, I fully agree. At the tail end of Sarek's life we learn he loved Spock. He doesn't tell or show Spock ever, which would qualify him as a terrible parent by human standards but he's a Vulcan so maybe that's not how he should be judged. What Sarek also doesn't do is end his feud with Spock which I think is a perfectly good standard on which to judge a Vulcan parent. So while I love Sarek as a character he's a bad dad.
Rom inspired his son to enter into a very successful career, just probably not in the way he would have liked. Then Nog inspired Rom to change career tracks and become a station engineer, so I guess it all worked out.
He tried, but he kinda failed and never went out of his way to make up for it despite having multiple opportunities. Not a bad person, just a bad father.
He's not entirely terrible in the episodes where his son appears. But Worf has been in around a dozen seasons of Star Trek (TNG, DS9, TNG Movies), and his son has been in like 3 episodes.
There's reasonable TV production reasons for this, but it's one of those oversights that feels really glaring on a second watch through.
So mathematically, Worf is the worst absent father imaginable.
At one point, Worf dumps Alexander with Worf’s adopted human parents because he feels like he can’t take care of Alexander (with the stimulus being his struggle to handle his son’s misbehavior at school), and Alexander has a really difficult time.