We've been members of C2C since 2011, and just signed up for 4 more years (for the price of 3 years). We really have no complaints with C2C (as evident by the fact we just signed up for 4 more years) because if you know understand how to use C2C to your benefit, it IS a great cost saving method. No, you cannot get into most C2C affiliated campgrounds on major holidays, but anyone signing up for C2C knows that upfront, as that is clearly stated. For us, this works fine because we spend all major holidays at our home campground anyway.
At our homepark we can stay for 14 consecutive nights, then we have to be offsite for 7 days, then we can come back onsite for 14 nights again. We use the C2C parks for those 7 days that we have to be offsite from our home park. For us, we camp the entire summer starting with Memorial Day weekend at our homepark, then after 2 weeks, we'll leave and go to a C2C park for a week or two (depending on which C2C park we go to) then we'll come back to our home park for 2 more weeks, then go to a C2C park for a week and so on. We do this for the entire summer, but spend Memorial Day, July 4th, and Labor Day holidays at our home park. In between those holidays, we travel to our favorite C2C parks, and yes we have a couple of favorites that we have never had a problem getting into during the past 3 years we've been camping this way. Also, I for one have never seen random weekends blocked out on C2C at the parks we looked at, unless it was a holiday week, but granted all of the parks we have been to have been on the east coast, so I can't say I've ever looked at C2C for a park in California or Texas for example.
With the friends & family benefit that C2C offers, even my inlaws have been able to use my C2C membership a couple of times per year on their trips to Florida and Myrtle beach at $10 per night.
I am in no way affiliated with C2C other than as a member for the past 3 years, but I can't help but feel like people that complain about it, either don't have the proper expectations or don't understand how C2C works. What I can say is this. Last year, my family camped a total of 65 nights between my homepark and various C2C parks, which last year consisted of 5 different C2C parks that we stayed at. After factoring in what it cost us to pay our homepark yearly dues, our C2C yearly dues, and to buy C2C points, those 65 nights cost us $19.66 per night (which included all taxes we paid as well), which is far cheaper than the average cost of any state park in my state or any other private campground that I've personally ever stayed at.
Not trying to sway anyone's opinion as I have nothing to gain personally by doing so. Just offering a perspective on how and why C2C works for some families, particularly if C2C is used to supplement a homepark that one may already be a paying member of.