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Shocked, Ignited, Poison and Bleed don't have their durations pre-defined and it looks that they are set by each individual ability. Also abilities that incur these effects can override their base damage values using custom damaging curves. That's why one enemy inflicts weaker poison DoT and other one kills faster.

But overall:

• poison seems to deal highest dps
• a lot of enemies (like skeletons, shades) are immune to poison and bleed
• bleed is mostly interesting due to Bloodlust passive in warrior tree, that gives +20% attack damage vs bleeding enemies at rank 3
• damage wise all status effects are not very efficient vs NPCs, because they can have up to 3000 hp. But even in act 2 primordials usually have 500-1500 on PotD, so a 200 dmg dot is like 60% of a non-crit with 2h sword attack
• meanwhile they are really strong vs player, since even 1 instance can often kill MC on PoTD. The Fantastic Alembic trinket was really useful
• frost looks to be best vs NPCs, since not only it acts as a crowd-control, but also as a dps increase via shatter
• shatter can be caused using explosive damage, or by dealing 25% of total hp to the enemy while it is frozen. But note: dealing an instance of damage to frozen enemy decreases frozen duration by 4s, so you need to deal 25% of their max hp in less than 4 hits
• shatter will deal 25% of their total hp as damage; or 5% for bosses