I recently found out that my ex had remarried, so was on wife no. 4. (Mind you, none of the previous marriages lasted all that long so she may be ex no.4 by now, with wife no.5 in the offing!)
I was his second wife and I think that's fine; if you excluded from the dating pool everyone who'd gone through a divorce, you'd write off huge numbers of people!
But in fact second marriages have a lower long term success rate than first marriages; so maybe third and subsequent marriages are less successful still.
I personally wouldn't commit to someone who's been divorced twice or more, but that's just me. (I wouldn't rule out a relationship, but I wouldn't commit legally). (And if they were all, according to the man, "psycho wives" or "ex wives from hell" or had unspecified "mental health problems", I'd be even more wary!)
What would be your feelings if you met someone who had 2 or more ex-wives?