I honestly have not seen a dk that doesn't go 3/3 in that, if he can. Of course, pet micromanagement is a must in pvp, even though it's just going to be way more frustrating than normal, since you have to constantly remind yourself every few seconds to check on your pet. I'll have to disagree with the part about pet leap being a little bugged though; its totally bugged, since it doesn't really work in the first place. And of course, it's not just the pets, its small minor things like Death's Advance, runes not being refunded upon getting parried, dodged etc etc that make life really sad.
The thing is, I'm actually fine with them focusing on Lodaeron at the moment, as long as they can really focus on Cataclysm after that, instead of starting on a new project and totally neglecting it, especially since Warmane has been running Cataclysm servers for a very long time now.