Strangulate to get its worth we need to catch them in a cast while facing them....not a huge deal. Oh and just make sure you have a rune available for it.
Simulcrum - We must copy a spell during its cast or basically predict the future, and all they have to do to counter it is use some crap spell.
Remorseless Winter - Everyone has 5 seconds to counter this CC. It can be dispelled, kited, and countered with multiple spells. Even if it does actually go off it is still dispellable.
Pet leap - Pet Gnaw if unholy is basically bugged because your pets CC is reliant on him having energy so if he just clawed someone you will end up waiting 1-2 seconds before it actually goes off. Oh and that is with a petautoattack claw off macro.
Lets now look at the other classes.
Blind is instant
Silence (Garotte) out of stealth
Stun (Cheap Shot) out of stealth
Kidney Shot (combo point requirement)
Gouge (Facing requirement)
Hoj/Fists of Justice instant stun
Repentance is just a cast
Blinding light instant
Shockwave instant (20 sec)
AoE Fear instant
Blood fear instant
Spammable fear cast
AoE Fear instant
Pet fear instant just drop him
Knockback (Explosive Trap)
Pet CC (Depends on pet usually a sleep)
Ring of Frost (Instant with Presence of Mind)
Polymorph (Also Instant with Presence of Mind)
Counterspell (can be used as a blanket silence)
Clone (Can be instant with NS otherwise is just after finishers or casted)
Bash stun instant
Bear Silence using farie fire glyph
Hex (Can be instant with their version of NS)
We are literally now the ONLY class with a main CC that is over 1 minute. Not only is our CC over 1 minute...it is at 2 minutes.
I really think in order for DKs to become competitive we need to drop strangulate to a 1 minute cooldown.