I think my Inquisitor was only level 25ish (hard to remember), but I did VERY LOW damage to non spell-casters. I remember swapping to a two handed weapon to try and solo better and it didn't really speed things up that much.
Because of this experience whenever I made my Deep Elf Inquisitor I dumped all of my points into AGI and INT.
Maybe not the wisest decision, but I feel like Inquisitors are going to be dealing low melee damage most of the time anyways, to the point where I question how useful STR/DEX actually is. I had no problems with aggro or anything. But again this was relatively low level gameplay.