Here's my $.02 coming from someone who is not a pro, but just trying to keep my own cars clean: When I first joined a few years ago, I thought the C&B section was great. There were some crappy posts, but many were threads from trusted veterans that, as previously mentioned, took the time to detail their process. I remember they would mention things like how the car didn't respond to a certain product, so they tried a different combination which worked great. Nowadays, it seems there are too many threads where someone just throws up a bunch of pictures, and barely mentions anything. The only ones I typically look at are the ones I know are by people that do good C&B threads, or if it's a car that I really want to see. Sure, I know the pros are busy and don't have the time, but it's not about quantity, but quality. I'd rather read a great thread from you once a month, rather than some crappy one every other day. One thing I really remember reading more, was when a person had a special situation that they came across, and described what they did to fix it. Those are the threads where people can learn from.
Some threads really are pointless. I've seen a lot of them lately where the subject says "new BMW coated with Opticoat". Who cares? It's a new car that needed little/no correction and you put some sealant on it. We all know that pictures don't do justice to the real thing, so that car doesn't really look any different in the pictures after the Opticoat, than it did before.
Another beef I have is too many/too few pictures. It seems the majority fall into this category. Someone starts out with "I didn't have time to take before shots." OK, the car looks shiny, but I don't know what it looked like before, so it kind of takes the luster out of the whole point of the thread. Or someone does a thread with literally 100 pictures of every part of the car. I don't want to see a picture of every stinking door handle. Show me a few overall shots, and a few key areas that needed extra attention.
But the one that really irritates me the most? Crappy pictures. I swear, half the threads now are taken with cell phones and have bad color and clarity. I can barely tell what color the car is, let alone see the swirls it had, or see how wet the color looks after it's done. I know very few people are going to also be professional photographers here, but take some pride in your photos and buy a reasonable camera instead of a crappy cell phone.
IMO, C&B should always have what you used, as well as what you may have tried that didn't work. Don't post a C&B every day, or even every week. Keep it to ones where you did something different, learned something different, etc. Obviously newbies are going to be excited to post their first real detail (I know I did), but after that, keep it to quality, not quantity. Post up a couple pictures of the car before it's washed, and after. I see a lot of threads where people post how awful it looks before being washed, but then they don't post any of post wash, so you can really see how the paint looked. Then don't go overboard on the process pictures. Post a couple 50/50 shots for the dramatic affect, but that's it unless you've got some special areas you want to highlight like if you did something special, or had a trouble spot to go through. Then finish up with the obligatory sunshine pictures. I hate the threads where the person didn't take any because it was too late/dark. Well what's the point of the thread if you don't have after shots? Isn't that the point of C&B? One other suggestion I really like, try to take the same post detail shots as you took prior to polishing. Especially if you are lucky enough to have similar lighting for both. Those are the pictures that really show the transformation. It's a bit annoying when someone has pictures of the entire car out in the sun prior to detailing, but then after it's done, they take indoor pictures, and don't even show the entire car to see the difference.
Take my thoughts with a grain of salt, but that's how I feel.