Really? Why is Quest 3 the issue? This one doesn't even have a Polar Warbear. Although the Yeti is always a problem; once you modify the rules of his grasp or find some other way around it it shouldn't be that big of an issue.
The only other damning part of Quest 3 are all the pit traps. A cautious player can avoid some of those... however I remember my girlfriend getting rather irate over the ones in the middle room... if the Barbarian player is gun-ho in this situation he can easily be surrounded and the -1 on attack and defense dice from the pit trap could definitely lead to their undoing.