What kind of PvE do you want to do with it? In general, what Theo said is right. The PvP reward gear is inferior for PvE because it puts too much focus on stamina and resilience which are very low on a rogue's priority list for PvE gear (the latter being completely useless). However, if we are just talking about maybe some heroics/kara, then you might be okay to just gem for hit and raid with it. There are plenty of options as far as PvE is concerned... and plenty of blue items from 5 mans/quests are better than some of the glad pieces when it comes to raiding and higher end PvE.
If you get more into PvE, you will most likely have to acquire a second set of gear for any sort of progression (if, in fact, you want to be useful).