Actually PvP aside, DPS guardians are 100 percent worthless in the new ops such as explosive conflict, With the tight enrage timers even a fully geared great player is going to have to be left from the raid group the DPS is way too low, the parces don't lie. This is something Bioware doesn't get. It's goes inline with the Shadow/Vanguard theme. Both are better tanks, and DPS speced there is no comparison. Until they give Guardian a real DPS tree, and major improvments to the tank tree they are ok at PvP for the moment is about all,, but 90 percent of the time your group is going to be expecting you to guard a healer
BTW I have a Guardian Full Rakata DPS and Tank suit fpr PvE and 7 pieces of augmented war-hero the rest battlemaster for PvP, so I would not agree that Vigilance is a total Win