I spent the last 2 betas just messing with character composition mostly. Of course, there was enjoying PvP, the emergence of Deshaan, the testing of the other dungeons, etc., but I also wanted to experiment with some class / weapon combos while doing those ops.
I have played each of the character classes, but for the past couple betas, I've been focusing on Nightblade.
Not surprisingly, DW has been my melee choice for the most part, although I do have to say, I enjoyed working with 2H wpns as well. One of my characters actually switched between DW & 2H, taking advantage of some of the differences between the two. For instance, I would use 2H for AOE instead of Whirlwind, but focus my extra DW skill pts on Blood Craze, but also on Sparks/Ember Explosion - which is quite fun in PvP. It was also nice having Uppercut/Wrecking Blow as a 2H add-on to really blast the fallen foe. It's also hard to deny Momentum if you're on a roll. When I did run the DW/2H NB, I took no points in Shadow, which honestly I did not miss. I know it can help with added burst damage, but it's nice having the added mana around for non-stealth operations. Once you decide you won't be stealthy, you find yourself with more mana to spend on offense.
I did try the standard DW & Bow combo, which does allow for the expected decent burst damage and the ease of short & long range choices. I did use Shadow with this build to decent effect.
I still have questions about Shadow and its overall usage. I enjoyed it, but in many PvP cases, it seemed not as useful as I thought it would be. If people have other experiences with it, I'd love to hear that.
Anyhow, this past beta I went for the weird dps/support role of DW/Resto Staff. I have to say I enjoyed it. I'm not sure it makes the perfect most optimum NB that there will ever be, but it was fun and useful. I kept people healed and gained lots of alliance points in PvP land. I was able to keep people alive while running dungeons and when my mana was low (or I just wanted to have fun), I could jump in and start wailing with my stamina-based DW attacks. Also, by morphing skills to be more group oriented (like the siphon skilsl Soul Siphon, Funnel Health), the leeching actually plays to the group heal aspect. I also was participating in Shadow, so I morphed the Ultimate into Bolstering Darkness for the invis + heal ability. To further support the group effort, I picked up the Siege Weapon Shield from the Alliance War group. I could protect the wpns and folks from flaming oil and then switch over to DW for some slicing and dicing. Good times.
Anyhow, if anyone has some enjoyable compositions or complete fails, feel free to post!