Quote Originally Posted by Nadirah View Post
They didn't "delete" them, they turned them into 5 man instances.

There's a difference.

Unless you're talking about Naxx and Onyxia, and those weren't deleted either. Those got a level bump and rehaul for Wrath.

Side note, SWG was finally shut down because SWTOR was being released, and LA didn't want folks confused as to which one they were playing, so they refused to renew SOE's license.
Does Tier 3 still exist?

To save you time the answer is no. The content was made so irrelevant they literally removed it and it does not matter.