It just fits my playstyle good. It's also fun having a pet that you can control when you're a melee . But, each to their own I guess. Would probably play frost but I really dont like the fact you're using two 1-h swords instead of a 2-h weapon.
Also, even though my DK isnt 110 yet and my opinion might change I get the impression that its a fast phased spec which I like.
You can always do the class trial before you decide to level a character which is great.