For me, the class got exciting at level 10. I absolutely love Vanguard. I'm tank specced (34 Shield, 7 Tactics), and I can take a hell of a beating in PVP. Paired with a healer that I can slap Guard on, I become invincible. Storm and Harpoon are your best friends in PVP, and the AOE stun (the name of which I'm blanking on) comes in very handy. In terms of ammo management, I know most people look down on Energy Blast, but I love it; I basically don't have to think about ammo at all when using it. Bottom line, you won't always have the top damage numbers as a Vanguard, but in terms of being a team player, you'll be invaluable. A decent Vanguard can really change the tide of a battle, I feel.