Ugh. that isn't what Yodhrin is saying. He is saying each class has its unique bits, but a large chunk of the game's questing content (not warzones and flashpoints, but planetary quests) is NOT unique. Hacking through the jungles of Dromund Kos, playing fetch for the Revanites and murdering crazy people in the Dark Temple is part of every single imperial playthrough, and it gets boring really fast. And the shared planetary quest content outstrips the unique class content by a significant margin. That is his objection.
Your sub numbers are well out of date (not surprising with that last article being from back in may). They've lost at least another 300,000.