Change is harder for some than for others. It takes time to get used to something new when the "old" thing had become so intuitive. Users need to have patience with themselves as they get familiar with the new forum, and eventually the new forum will become intuitive as well. Don't blame the new format for your learning curve.
If there are glitches or bugs, then yes, those need to be reported. However, the general, "I hate this" messages are of no benefit, as are the "I love it" Someone put up a poll for that. But honestly, it is what it is and those having issues managing through change likely have a problem with change in general.
I haven't found any issues with functionality as I've browsed around, posted, read, subscribed, added pictures, etc. It's just getting used to where to find things, which I've noticed isn't hard once you have taken time to look around.
Don't let it get you down. And I'm sorry that after all the work involved in making this transition and the dedication of those involved, you have to listen to negativity around it.