My only issue with this expansion is the INSANE ammounts of item level increases from each raid difficulty. Molten Core was ilvl 66, Sunwell was 154 (164 from KJ). Giving us a total of 98 ilvl from the earliest raid in vanilla to the last raid in TBC.
Early WotLK to End WotLK 200(Naxx 10-man) - 271 (Ruby Sanctum) 71 ilevels Total
Early Cata to end Cata 359 (BoT) - 416 (DS) 57 ilevels Total
Early MoP to end MoP 476 (LFR MSV) - 588 (SoO full hc WF 2x upgrade) 112 ilevels total
SoO alone has 528 from LFR to 588 to fully upgraded heroic WF. 60 ilvls from ONE raid!
And please for the love of god. Remove the god damn Warforged thing you got going. It doesn't make the raid more exciting to do. It's a stupid thing that inflates stats and item levels even more than this game should have. I can deal with item upgrades so i have something to spend my valor on but Warforged is just random and annoying.
Challenge modes and Proving grounds brings a great philosophy. The items matter, item levels doesn't. (to some extent)