the problem is the heroic modes

in TBC to many top guilds blasted through to T6 content stupidly fast
thus slow release of raids
to many people getting bored
thus heroic modes

consider the "tiers" of gear though (not tier armour - ilvl sections)
from ulduar 10 normal should of been
U25
ToC10
ToC25
ICC10
ICC25

it ended up as:
U10hc
U25
U25hc
ToC10
ToC25/ToGC10
ToGC25
*********ICC10 (put in just under togc25 to try and adjust)
ICC25/10hc
ICC25hc

even if you ignore ICC10 because its under ToGC25 thats still 8 levels of gear not 5
and with the scaling of OP stats (crit on fire mages for example) its taken us well beyond where we should be for ICC
ICC might of been adjusted for it but that still leaves us stupidly overpowered for lower end raids

presumably blizzard will account for this in the next expansion (less difference in gear iLVL? or the mounts/pets/trinks sugestion etc?) like they did for leveling proffesions

when TBC came out new 58's were miles off getting 300 skills because they were suposed to be a grind before
then WotLK - proffs start 25 levels below (and later fixes like vanilla herb/tailor drops in TBC and increased rates for other vanilla proffs)

they fixed one problem - got another - and dealt with it
they will do the same for iLVL and cata