I don't wish to get into the ins and outs of technical pitfalls or debates. I'm not a wedding shooter though I have shot a few shots at friends and family weddings without stepping on the toes of the pro.
I would, however ask the OP the following questions:
Is your bride a photographer or otherwise artistic professional?
Have you asked her what she thinks of them before going into a technical breakdown of the shots?
As a photographer, you're too close to the art. This is why my older brother who is a chef hates it when my parents tell waiters in restaurants that he is a chef. It makes him roll his eyes, and often the waiter does so too. If you evaluate these in a professional way without first asking your bride what she thinks in an open and unjudgemental way without a leading question, then you risk alienating her views. It's easily done. You also risk spoiling the memories of the day.
If the other photos are of a similar quality, then what you have is a collection of pretty competent photos. You can only challenge his work if he is incompetent. You will struggle to prove that on the basis of him not changing his settings. This would set in chain a chain of events that would taint the memory of the wedding day.
If, however, your wife hates them, and does so without any influence from your technical knowledge, then perhaps you should speak to the photographer.
Ok he was expensive, but if he has failed to come to the standard you expected, did you do enough preparation in researching the quality of his actual work, and did you sit down with him and tell him what it was you were expecting from him? You cannot assume a certain quality just on the basis of the price. You don't necessarily get what you pay for. It's up to you as the client to do your research because things like this are quite often subjective and so therefore difficult to sort out via litigation, and there is a real risk of soiling your memories of what should be the happiest day of your life.
Do the photos represent your memory of how the day went? Do they capture the spirit and feeling of the day? (Settings won't come into this - it's a sensory thing) Did he get everything you asked him in the pre wedding meetings to achieve?
Personally worrying about what settings he used is a real downer and you are really overthinking things and I really do hope you haven't gone over the photos with a critical eye if your wife does actually like them...