If you're clients are happy with them, then they're perfect in my opinion. Here's the only comments I have on them:
3: A little too much space to the right. Whatever that is in the background is a little distracting because of the odd shape.
6 & 7: Too much space to the left and the top of the groom's head is clipped. To me this would have been better in portrait with a little background above both heads.
10: A little too much background at the top.
15: The devilish grin on the groom's face and the location of the brides hand is a little uh... suggestive. Unless that's the purpose it's something to watch out for.
18: A little too much noise for my taste.
20: A little too much space on the left.
Overall I would say they were VERY nicely done! I love the color and exposure. Not sure how much direction you had to give the bride, but it doesn't appear you had to give her any, they all look very natural and wonderful. Your focus seems to be perfect! Unless noted above I think the placement of your subjects was spot on and very attractive.
My favorites are 2, 7, 11, and 19.
You can just hear "Thank you" from both the bride and the groom in 2.
In 7 the bride just seems like all her dreams have come true, the color, exposure, background, focus are all perfect.
11 is obviously a story teller and it's a different story to anyone who sees it.
19 is my absolute favorite. At first I felt it should have been cropped in a little on the right, but then I noticed just what the background was and I think you did an excellent job.
Overall: I certainly hope this couple was thrilled with your work because I think you did an excellent job.
Edit: Forgot to mention that I love the idea of the couple walking through town. Very creative and done very well on the perfect day!