The very best way to know anyone's traits is to live with them. You lived with this lady long enough to have had two daughters. You know as much about her "traits" as anyone is ever going to know.

The two of you got married, thinking that you were going to be happy together. You were both wrong; it didn't work out. Right now the "blame" is kind of irrelevant. It doesn't sound like she was the most charming person in the world. If you want affirmation that the failure of the marriage wasnt all your fault, here: I'll bet 10 dollars to a donut that it wasn't all your fault. Be glad you have nice daughters, and have the best relationship you can with the two of them.

As your girls grow up and eventually get into long term relationships of their own, they will see how hard it is to make a relationship work. Then they will be more understanding of both their mother and you. They probably understand quite a bit already.