"Old" content is getting stuck in MC/BWL/Ony/ZG/AQ10 (T1-2) while a select, lucky group get into Naxx40 and break your face into bite sized pieces in PvP with the gear. Even during this time, WoW was considered the easiest MMO to ever be made.
TBC fixed that for the most part and WotLK pushed it too far, I think this (as far as end game goes) is perfectly balanced. Proper raiding takes time and commitment. It also takes social skills and tolerance of bullshit (thickskin<(><@)