Looks good overall!
You've already noted the issues with tight compositions, so I'll just note that I agree. When you're covering ongoing action over which you've little direct control, background distractions and non-ideal compositions are inevitable so in the end it's about choosing your compromises. You might consider being more forgiving of some backgrounds rather than cutting them out. It's a bit strange when the top of the frame is nicking at people's heads in group shots.
Scan #4 looks like one of your flash failures. The bride's skin is rather darker than all the other shots and I personally don't feel it's the most flattering poise for her.
Some of the group shots are, aside from tight crops, a little awkwardly arranged, but again, that's going to happen with events.
I'm going to mourn the passing of 800z now.