I agree on most off the above.
RDM is needed though sometimes we use whm.
bard: prefer to have blm for climbing.
DDs: well all should or better to say could be /sam (using 2handed weapon) As for sams should / could be /war.
In my own opinion, /nin mostly is for cheap sneaking...
bring oil and powder and you got more dmg >> faster killing on floors >>> more success.
Edit: i see previous post is saying the same but mehh posted already before reading