There’s a few out there that are hard to navigate but for the most part, they are easy to learn for me. Some I like better than others but that could be because I’m on those the most i.e. Proboards & Xenforo. What about you?
I have no particular dislike for any platform, however, if the platform is hard to navigate or contains a lot of intrusive ads, I might not return to that platform.
I wouldn't say there is any kind of forum software that I dislike but some of them are just not clean-looking and can sometimes have a little too much going on and they are the ones I tend to avoid if I can. I will register to almost all forums if I have an interest in what they are about but if the layout becomes too much I will just close the forum.