I have a Battle Cleric lvl 103 and I can solo when I want, what I want without any problem. And I enjoy parties as an active killer as well as I can support my party members efficiently.
You willl have all the fun you want if you know how to choose your stats/skills wisely, but it requires to think a bit about your build.
You are soooooooooooooooooooooooooooooo wrong.