So you think that the hardest encounter in the game should be made trivial with a warlock pet?
Sorry, I don't feel that using a voidwalker pet trivializes the encounter. It may make it more manageable and take a huge amount of frustration away from the warrior and pally tanks because we flat out can't do it without relying on perfectly timed cooldowns and having enough of that class and spec to last long enough.

Our guild has the DPS for it, we have the healing for it, but we don't have the tanks for it, which is sad considering we have 3 warrior tanks and 3 pally tanks that all are damn near best in slot. We're getting the first drake down before the second one even lands. We're blowing our cooldowns but it's just not giving us enough time to get the second drake down before our MT ultimately gets 1-shot.

Our guild is basically giving up on it because we don't have any DK or Druid tanks. This voidwalker tank is pretty much the only light we've seen in the tunnel and now that's it. We've wiped enough on that boss that our raiders aren't showing up anymore to attempt it because only with insane amounts of luck are we going to beat it. And I can't stand fights completely based around luck.

So, again, the voidwalker is not the problem with that encounter.

"bring the player, not the class"