I recently played through it on a caster. There are bugs to work out with familiars and resting from what I've seen, and some commands are a little awkward. I'm sure a lot of it will work out and take some getting used to when PWs get out.
The spell scripts are horrid. They copy/pasted from NWN1...
As for the actual campaign, it was a little easy (a large part due to crafting, also due to mobs' easily abusable will saves), but I thought the story was pretty interesting. The ending sucked, though.