DK's suck at most things in the game, and the rest of the game they are barely mediocre. We are absolute trash in PvE, and mostly trash in PvP. I won't get into why DKs are bad in PvE, the numbers should easily explain that.
In PvP the only role we can fill is target caller, and other classes can do that just as good if not better. We have no place in arenas, period. When I'm on my druid, DKs are literally not even a threat to me unless they're paired up with 2+ DPS (and one of them better be a rogue). We have the worst utility, mobility, and CC in the game by a large margin in all 3. Our survivability in 3s is among the bottom 3. Our damage is mediocre and takes way to much time to setup, and is made out to seem bigger than it is because our diseases effect everything equally (still hits like a wet noodle, we just get a lot of noodles).
I seriously cannot express in words about how mindblowingly frustrating it is to play DKs are in PvP. I mean we're a DoT class, yet there was a Warrior I encountered whose Deep Wounds out damaged both of my diseases COMBINED. I quit playing my DK that day.
PSN: Settai UMvC3 Main Team: Magneto/Morrigan/Sentinel