In fact, Rangers have a good damage output? I saw some comments about this
The monk on the other hand, is an entire other story. The monk is about going straight to the boss and enemy spell casters and effectively shutting them down.
I checked the post, a few things come out as a bit outdated.There's an old, but still relevant, thread on this.
Long story short, barbarian comes out on top as to both damage and Survivability, but the more fights between rests the better the fighter does. The monk lags behind on dealing out damage and survivability in a straight fight(but, in theory, has other benefits he can provide).