The most frustrating aspect of Siri's quality decline is that super-basic things inexplicably stop working. For years I have been able to say "call <wife's name>" and Siri called my wife. A couple weeks ago she started dialing another contact I haven't talked to in 15 years with a similarly-pronounced name (but different spelling). I had to delete the old contact to stop that behavior from happening.

I mainly use Siri for cooking timers, I really enjoyed the brief period of time where it started flipping 50 minutes and 15 minutes. And then went back, for some reason, but not after I started using things like 14 minutes and 59 seconds or 51 minutes to make it think just a little harder.

First thing I did when I got an iPhone was disable Siri as much as possible.

They said it was Apple Intelligence - they didn't tell you how intelligent it would be!