I have/had a crap dad (I truly suffered second-handly from his neglect) and I have to disagree that no dad is better than having a dad. Over the years my relationship with my father has changed as he's grown and matured. It's still not perfect, but occassionally he trumps up at the most unexpected times. I was down recently and he was very encouraging and had my back 100%. Due to not having had a traditional father daughter relationship, he can be very candid in a way that can be difficult to take, but also good sometimes. He can tell me things about my relationship from a man's perspective which helps. There is and will always be a certain amount of underlying resentment, but its not all bad.
My half brother on the other hand has had no contact with his dad since quite young, after he was wishy washy with his visits and my mother told him to just stop visiting altogether. That has serioysly backfired. My brother has very low self-esteem, has a huge amount of pent up anger, serious depressive episodes, has tried to commit suicide, and has struggled to find his way growing up as a man mostly surrounded by women. He's getting better but he's had questions he can not get answered, as well as discovering more siblings his father has had since, which he had no knowledge of and has had no contact with. He would see our father turn up, intermittently, but still turn up, whilst his never did. I really felt for him.
Compared to my full brother who has sized everything up, asked questions, and decided of his own volition to only have minimal contact with my father, having made this decision through exposure, his own assessment etc. He's happy with his choice, and is determined to be as close as possible to his own dd and not repeat our father's mistake.
I think it is for a child to judge and choose what relationship they have with a parent bar something extremely serious. If a parent is wotless, they can later weigh up for themselves where they want the relationship to go or not. Relationships can also change and improve with time and from experience, those I know with rubbish parents often learn lessons and do better with their own children. People I know who don't know their father's are left feeling like a piece is missing. They don't have anything to place in context.
Father or no father BOTH are bad. But ime the former is better.