What do you think it was about that Barbarian that you didn't like? Is there something to add to that list?
Mages generally have more narrative control through reliable abilities that allow you to contribute in different aspects of the game that don't involve playing "mother, may I?" games with the DM. This was in contrast with my barbarian. And usually this is sometimes the part when people here would insultingly suggest that I was being an uncreative or not a good player.
Moreover, this was substantially less of an experience for me that I felt when I played 4e D&D, where I played warlords and fighters, and I had fun doing so. When I tell you that I personally had fun playing non-magical classes for the first time in 4e D&D, I'm not interested in the fact that other people hated 4e D&D; however, those toxicity of those people nearly had me walk away entirely from the hobby. What I do care about is the fact that I had fun playing martials for the first time and that it was with 4e D&D.
Let me be clear here. When I was playing the barbarian, I don't think that this was with a jerk DM or a bad DM. I have sat at many D&D tables with good, kind, skilled, and/or experienced DMs where I observed similar issues time and time again.
You may be a good DM, Bill Zebub, but I may still dislike how you DM. You may be a good DM, but I can still dislike the sort of game systems that you prefer playing. You may be a good DM, but I still may not have a fun or good experience at your table. You may be a good DM, but I can still have problems with playing a barbarian at your table. You may be a good DM, but you won't necessarily magically solve the problems I had if you had been the DM at that table. More importantly, I would personally not like to insinuate that you are a bad DM as a result of any of this.
When you make erase problems and bad experiences that people have as solely down to "bad/jerk DMs," you discourage and incriminate a lot of good DMs out there while doing little to address the experiences, preferences, or play style differences of others.