Welp, soloing dungonz isin't that easy unless you're well geared ( epic ones ( normal dungeons are reaaaaaly easy)) but the best class would be GWF with about 3k-BiS IL <3
You better not HAMSTER up pvp... I saw that Q&A http://www.mmogames.com/gamearticles/neverwinter-the-maze-engine-interview-with-producer-lindsay-haven/
eather a CW or HR, GWF needs some specific gear to become good at pve/pvp, though you can chose DC and go righteus and be a good suport class, do serious dmg in pvp
Let's look at this whole thing like this : Paladins are unkilable, why not give a counter to that? a endless lopp witch most of the time ends badly for the SW since you know...paladins :D