You should not give up,
I have only done one wedding, and this was 20+ years ago, also for a friend. The shots turned out, I guess after your experience I was lucky, but this was done with MF, and on a sunny day. Night shots in the reception hall also turned out well when using both flash and natural light
The reason I didn't do more is that I don't have the patience to deal with the family of the bride (especially).
What is interesting, is that I took all of mine with manual focus. WHat a great thing a fast 50mm and a diagonal split image were especially for lowlight focusing.
I also took everything in manual mode, not auto mode. This has always been the way I shoot, because I find the programmers never think the way I do.

This is especially true with flash photography, where I always shoot manual mode. I simply don't trust auto ISO, auto exposure, both of which try to take shots without a flash even when it is attached.
You should not give up, but perhaps try shooting "in the background" to see how your equipment performs. This is critical, and one thing that probably got missed is the ability to try the shots at a rehersal the day before.
p.s. next time don't forget that the bride should have her boquet in all the shots (I did, OPPS

)