The first of these things, the disconnected plots, are not really that big of a deal. Some people love it, some people don't. In my opinion, they are not that good. Flying around the plotworlds and viewing others plots is fun and can often give you inspiration for your plot. But again, this is probably not the reason why freebuild failed.
IMO, this is one of the main reasons why freebuild failed. The fun of creative servers is not only building your own plots, but also viewing other's. And you would probably say "well, then go to the menu and search for the best plots" well that's when the next problem begins:
The diamond system, however, was (and still is) a big problem. Why? People only cared about getting diamonds. Making a good plot was not important. If you played freebuild at the release, you will remember that you could barely chat due to all the "Come visit my plot and don't forget to give it a DIAMOND" spam (check the spoiler below if you don't believe me). Freebuild used to be a mix of chatting with friends and building. Now it was just building. This also lead to some horrible plots being on the best plots list. Some of them are still in the list of Hottest plots.
I would like to see other people's plots, but all the plots in the top most voted are either a staff member's plot, or a spammer's plot. There's nothing wrong with staff members making plots and being in the top, but the spammers' plots bother me a lot. They are often pretty bad, not inspirational at all, and sometimes even inappropriate. I think resetting the diamonds every day would be cool to see new plots every day. Even deleting the whole diamond system would be better...
Not too long after this, we began to notice that there were no world-edit. This was another massive disappointment. World-edit makes building a lot easier and more fun, and it is something you would expecet on a server this big. But no, no world-edit. This was later promised to come out later, but it's been months now since the release, and no updates have been released.
Now, in my oppinion, this is the biggest mistake. At first, the excuse was "well, it's against the EULA to give donators World-edit." So then the community said "Well, what about making it free for everybody?" then, the excuse was "Donators would feel scammed if stone rankers got world edit for free". But Cubecraft, didn't you think that the donators would feel even more scammed if we got nothing at all? Some people even got a rank just to get worldedit...
Freebuild is broken and I think it should be put back into maintenance.
Nope. It is indeed broken, but please, no more maintenance, for CCGN's sake. Somehow, people prefer a broken game than no game at all...
Fix it without putting it in maintenance.
And now one of the things I hate the most: When creative was released, they promissed to release skyblock shortly after. Where is skyblock? Well, we will never know, I guess. Perhaps they saw that creative's system did not work at all and they had to start skyblock again...