I had trouble with them when I first started. The scripted party members suck.
After watching a few of sensukis videos and playing the game for about 13 hrs I got a better handle on the mechanics and strategy.
I play on hard and I took the temple of eothis with my pc at lvl3 and my mad party members at lvl2.
Basically rogue with arbalest and a monk destroys shades. Get that sneak attack on a shade and throw the monk at them. Tie everything else up with tanks and destroy them with mage arcane encounter ability.
Kill shades first they are priority number one!