The first, is the software. While most web forums use phpBB or whatever, Square-Enix decided to roll their own.
This is not informative.
They distinctly lack any information as to what the sub-forums' threads contents are. It's nice there's Job Specific forums, and slightly odd that there's no World specific ones, but what's in them? That's a lot of clicking to see threads without making an account. (I have no desire to post there.)
The second, is that the posters are idiots. I know it's shocking: I found stupid people on the Internet. But hear me out. The first thing Sqare-Enix posted was a thread saying, "Hey, maybe make your threads' titles in some way reflect the posts' contents?"
So "Awesome idea for PUP!" would be an example of a bad thread title.
"Give PUP A+ Great Katana skill!" would be an example of a good, but stupid, thread title.
And here's an example from the forum.
Clearly, nobody read the "READ THIS BEFORE POSTING" sticky before posting. Again, I know people not reading the FAQ/Rules/any stickies before posting isn't news, but not banning people for being retarded on your forum makes your forum kind of retarded and buried under all the stupid.
EA/Bioware got some bad press for banning a stupid (although humorous/correct) guy from their forums. Square-Enix should probably at least do a little forum cleaning. (Bans affecting accounts would be a bit severe.)
So, yeah. Sucky Official Forum is sucky.