Agreed. We also did a Whole 30 and were very strict about eliminating ADDED/PROCESSED sugars, grains and dairy. Since finishing we have reintroduced some of those things in moderation but are still mostly grain and dairy free and avoid processed/added sugars and try to stick to honey and the like for sweetening. I'm not sold on the shakes adding benefit, but I find it very hard to believe they do any harm either, so why make an issue of people making choices to try and live healthier? I don't think anyone could seriously contest the fact that whole food from healthy sources is a better way to eat than processed foods. And, I think people don't do a good job always of explaining the fact that we are talking about eliminating added and processed sugars. Obviously, sugar is the fuel our body burns most readily and we must consume it to survive. But, there are many whole foods which contain significant amounts of sugars that are a superior source than most processed forms. I'm always confused by those who want to be critical of how someone else chooses to eat. Nobody is saying that it's a good fit for everyone nor that the typical American diet can't be acceptable for many people, so why denigrate someone who is trying to improve their health in another way?
To the OP, the first few days are definitely the most challenging as you deal with cravings for certain things, but it does ultimately improve. I never had any "carb-flu" effects, but, man, did I want a candy bar!! We've now been eating this way for almost 90 days and I've discovered my tastes have changed dramatically and I enjoy vegetables and fruits far more than I did in the past. I think that's nothing but a good thing.