The damage spread for spiders is also high. If I die while not legged, I tend to have basically all my armor blown, lost an arm, and someone finally takes out a torso section. A spider has approx. 300 total health counting internal and armor. If you're blowing things down to about 20% hp, that spider has taken at least 200 damage, all of which was spread out due to convergence issues, and much of which missed. Plus, they're hard to hit as they are pinballing around. It doesn't seem unreasonable to me that all these factors combined are making them difficult to kill without having any real hitbox issues.
Edited by ohtochooseaname, 23 July 2013 - 03:26 PM.