Archers for PKing - you don't want to get within 600 range of people, because you'll find yourself slammed with silence, root, sleep and all those other nasties.
If you want to be a pk'er... as Maline said, you don't want to get in range. You get rooted, you might just be toast.
And those dagger skills. At what lvl does one get them that they can go through cp (I'm actually asking, I have no idea, I believe they are new)?
Because if you want to be a pker, are you really going to be lvling your character to the upper lvls just so you can take out some poor lvl 15 in the noob towns (and now that I think of it, it wouldn't matter if you had these higher lvl skills... taking out a lvl 15 wouldn't be hard). Provided you can find a lvl 15 in a noob town.
Daggers are great in close quarter fighting or large group fights where they can take advantage of the chaos and sidle up to their enemy and take them out.
Now, if you are just looking for a good pvp character then sure, Daggers are great.