the rate of divorce in the frum community is rising according to the JSWA statistics
Compare to the non frum community.
If there were statistics for the communities that use shidduchim vs. those that don’t, I would say compare them.
Yes, there are marriages that should not exist which do because of social norms. There are also many which end up being worthwhile which would have ended in other social contexts.
We’ll never have precise statistics, but I’m quite confident that despite its flaws, our system is the best that exists.