I'm about two weeks in, just getting to the world PVP zones on Tordin (I think.) and I noticed rather early into the Warfront that pets themselves seem to be pretty hit or miss. I'm a 22 Necro/Lock/Dom, the game is fun and pretty easy but thats to be expected. Let it be noted that PvE necromancer is probably the most fun I've had in the game.
PVP wise though, despite the pets getting a nice buff on the Warfront, I notice they aren't really much more then interesting low health roadblocks. My rouge Skeleton gives me the best results so far, but even then I had started to just go to my backup Archon role and support and DPS, because I wasn't getting much done. DoT and longevity is nice, Necrosis and Grave rot are great.
Is there a secret to pet PVP leveling? Is there a benefit to having a pet class in world PVP, because I've yet to find a group of enemies I couldn't particularly outlast, but even with Soul Purge and Charge stacking, I wonder if I'll bite the big one cause my pet can't tank a player.