Is the rate of gravitational wave detection roughly what was expected?
I’d have to dig more to find some references, but the existence of $M &gt; 30\ M_{\rm Sun}$ black holes was a big surprise. So a bunch of the events that have been detected are from a class of objects that wasn’t predicted at all.  Originally I believe that neutron star - neutron star mergers were expected to be the main class of events.   I don’t know how that NS-NS merger rate has stacked up against expectations.