It is entirely a waste of points prior to Awakening.
For the actual quest, I'd take it. I'll try and ask around and find the actual evasion values for the bosses, because if it's high enough, you may not need it. Unless you're really geared, prepared, and experienced at the game, and know you won't need it, new players having their first go at it will probably benefit from it, so I added it as a recommendation.
After Awakening, it.. may help? I've heard some players say some mobs can have high evasion, but to be honest, I would not invest the points into it even if that were the case. Your points will likely be spread thinner after Awakening (I consider 95 points more or less mandatory post-Awakening [for Wizard], depending on if you need the full 20 in crit damage, and speed and defense could need more/the rest), so finding another 15 for accuracy is a real luxury. I think +20 weapons and armors alone will give you 37 accuracy on a Wizard, before any other additions.