While the title may seem harsh, I think it is quite appropriate, and I will explain why.
Meagoinc rather succinctly pointed out the purpose of OP to most every gamer here - a tool to improve the game, most often as an immersive tool to help you feel like you are really in the setting. It's not just an overglorified notepad for tracking notes, it's meant and used as a medium to support the game; whether as the primary vessel (like with PBP through the forums) or as an adjunct to table-top games. This core purpose seems to have been lost in the Reforge - at least in terms of UI changes. I love a lot of the discussed back-end changes, although much of it seems to be broken (tags) or stretch goals not yet gotten to (natural editing). What we are faced with instead are drastic UI changes seemingly meant to hype OP (gargantuan OP header? Really?) or make it look like a smart-phone app instead of a simplified canvas that allowed even the free members some decent modicum of creating their own masterpiece to accompany and enhance their game. Now, the usable space is drastically diminished (both width and height), and we can't get away from certain elements always looking like they just stepped out of an I-phone. Not exactly immersive when your setting is medieval fantasy, old west, WWII, or any other number of settings that aren't strictly modern-day. Even for ascendant members, the options to change things boils down to undoing what was changed as an "upgrade", giving us the freedom to downgrade the UI changes to get back to a campaign focused on delivering content rather than a pretty, modern UI with lots of clean, unused space. It feels like the horrible violin player that hangs out by your table who you pay to go away. If this is meant as incentive to free members to upgrade, I doubt that it is having that effect. It's not even about specific campaigns needing to be redone (I haven't even looked at my most heavily CSS'd campaign yet, and probably won't for at least a week), it's about the members feeling like their needs were ignored. Will OP lose members over this? I'm afraid they will - you can do quite a bit of modding on a GuildPortal.com site to give the feel you want and the forum (and subforum) structure you need. Heck, even Wikia.com may serve better for providing an immersive experience now, at least in terms of free access. Again, I sincerely doubt driving people away was the objective, but sadly the UI changes seem likely to do just that if the forums are any indication.
Devs: I can appreciate the desire to make a bright, shiny app that looks like modern apps today (at least for smart phones). That said, you also need to understand your target audience, and in this case it feels like this really wasn't done in terms of the UI. The decision to limit beta testing to a select few who paid for the privilege was an exceedingly poor decision as well, as it limited feedback before roll-out. There is a reason why professional software companies (game, app, whatever) have closed (but free) betas followed by open betas - more feedback BEFORE you are judged on results is always better. By choosing to have a paid beta program, you not only limited your feedback and shot yourself in the foot, but you also changed your beta demographics, which skews results and ends up with the uproar you have now. While this can't be undone, I do believe there is a step that can be done to help address the frustration.
I would heavily suggest that you restore the old OP structure, then open up a beta on a sandbox server with access to all ascendant features (for anyone, ascendant or otherwise). Don't stress that it's October and your original target was August, focus instead on "getting it right". Let people make as many campaigns as they want, with the understanding that it is temporary for testing purposes only and will all be wiped at least every two weeks. Work with beta feedback, which will be far less fueled by emotion than folks having their hard work (often months of effort) go down the drain (at least by perception). This also gives the devs time to address issues calmly rather than in emergency mode, which is better for everyone. From a business standpoint, I also think this will do wonders for damage control and prevent a great deal of potentially lost business. Again, I'm not saying go back to the old OP permanently, but the new stuff simply wasn't ready for distribution, and your paying customers are the ones suffering for it.
There is no shame in saying "we jumped the gun, we're not ready, but we will put things back and want everyone's help going forward to make this the best gaming tool possible". The gaming community is generally pretty good at helping when needed (from my experience), but they are also quick to react when they feel they have been victimized.
Just my two cents, and I hope it is taken in the constructive manner in which it is meant.