You can never judge a person on a “statistical basis.” (I know some statistics – I’m not just talking though my hat 🙂 The kids didn’t cause the divorce. The parents, and sometimes only one parent, caused that. You have wonderful, warm people coming out of very difficult situations. What if it were you? Would you want to be judged and automatically condemned for something you had nothing to do with?
That said, of course you have to do your homework. But even with someone from a non-divorced family – what if there were terrible problems in the family, which severely affected the children, but they didn’t get divorced because of fear of social disapproval, and just toughed it out, mangling the kids in the process?
And as far as mechutonim go – some perfectly “normal” family situations can include an in-law you wish lived in Seattle.
There’s no safe rule. Life is hazardous. Do your homework, daven, and make up your own mind.