I haven't had time to play for the last week. It's the first online RPG that I've really played, so my opinion might be taken with a bit of salt.
I can't see how a group with T1 gear can complete any T2 dungeon without exploits. My TR is now 11.8 GS, with a stone, and I still won't go into T2 dungeons unless with my guild, which means mostly 12k GS players. For CN you basically need either 2 DCs, 2 CW and 1 TR, or 1 DC, 3 CW and a TR (just to run, actually). So in my opinion the game is facing a few balancing issues.
Most T2s are easy with a well-geared group, but most people prefer to then farm either CN or MC, so unless you're in an active PvE guild you're going to struggle to complete any T2. It's actually easier for me to do CN at the moment, as the main players in my guild are farming it like crazy.
BTW - I buy/sell keys for an income. For some reason people actually buy them from me, when they can get them cheaper in the ZEN store (after a quick AD/ZEN transaction). I've already made a couple mil AD that way.