I am currently discussing this with my group.
Our wizzard is in love with his powers and he seems to take any cut personally.
Last time my group faced an iron golem where he was pretty much useless. He realized this after 2 failed magic attacks and left the room for the rest of the evening. --°
If he does that again I will have a more serious talk with him.
Compared to that our rogue had time to shine as his sonic and thunder bow totally did the job here.
We also had a druid (rust dragon) with us, but she couldnt use it as 2 of our melees stood in front of the golem.