It's a shame your folks aren't here to defend themselves, their marriage, and how they raised you.  My grandparents always fought for as long as I witnessed their 60-year marriage, but we just saw that as how they communicated.  They had three kids, many grandchildren, and created the most wonderful family that continues to grow even though they are long gone. 

Interestingly, I look back on their marriage, and the fights between my wife and me are easy to deal with and get over.  My kids might even view my and my wife's marriage as us being miserable, ha, ha.