challenge mode is just another illusion to create more content, i done glory of the cataclysm raider in blues the first few weeks cata was out, once you have the knowledge of the encounters nothing is a challenge for long.
ToR PvP is way more balanced than WoW has ever been, 2 players of equal gear and skill in ToR means an even chance, same doesnt apply in WoW it mainly depends on the class you are if skill are gear are matched.
I said as ToR stands now it has everything is needs, yes it has taken some time to iron out but 6 months is not a bad time frame, players have unrealistic ideas and want things now when it takes time to get things done, maybe if ToR waited 6 more months it may of held onto more subs but who knows if all the current features now in play would of been there, its better to get the community to say what they want.
WoW is pretty much the only only sub option game around, WoW has maybe one/two at most expansions left in it.