From the 1.0.3 patch notes:
Damage Over Time (DoT) skills will now properly benefit from items with the +Critical Chance affix
So, hypothetically, if I'm using a demon hunter with 2.5 attacks per second, and I use impale with 2 seconds of bleeding, then do I get 5 chances to crit from one impale?
Best Answer
Yes if you wanted to take your auto-attacks into account. No if you are ONLY taking the Impale ability into account.
If you're considering auto-attacks and impale critting in the same second:
If you're considering ONLY impale and the rune's total effect:
What the Damage Over Time now affecting crits means is that now DoT abilities themselves benefit from crit on each tick of the DoT's damage. For example, impale's runed bleed does 125% weapon damage over 2 seconds, which means it deals 62.5% weapon damage every second. The individual DoT ticks that do 62.5% weapon damage and happen once a second are what now benefit from crit.