Originally Posted by
kranur
Attunements aren't really as much as some make them up to be. They're mostly a few quests and dungeons that you would run anyway.
Hitting revered for the heroic keys will require repeating them a bit but there are also perks that come with that rep like enchantments, patterns and depending on your luck with drops, gear.
The only real problem that was back in tbc was the kael wall that prevented many guilds to move into t6.