The changes were made for several, very valid reasons, which were discussed, in great length on the forum, before the changes were made. One of the most important reason, which should be important to anyone who uses the internet, was security.
The version of VBulletin we ran was no longer supported by software updates or security updates, because it was so outdated.
To touch on your 2 or 3 complaints, which are very easily "fixed."
The layout. If you don't like the layout, you can switch to the "Reeffrontiers Style." This option is at the bottom, left of every page. It's a much more plain style but is an option.
Subscribed Threads. From the Forum Page, near the top, you'll find "Quick Links." The very first option, in Quick Links is "Subscribed Threads."
Settings. Again, from the Forum Page, near the top, you'll find "Forum Actions," it's to the left of "Quick Links." In Forum Actions, you'll find "General Settings."
I understand that you felt that the old format was "running perfect," but this was "your feeling," not in fact correct.