Shadow in PvE is not doing well. My Priest is 240 ilvl, my Pally is 233. The dungeons I do I can feel how much less damage Shadow does. I also simmed both of my classes. Pally does 46k dps, Shadow comes out at 40k. Thats a big gap. I can deal with how the class plays, tentacle slam is fun both trees feel fun. (Halo might be the best spell in the game in terms of looks).
But its clear Shadow needs a buff damage wise.