Ask WoW Insider: Heroic instance difficulty

Welcome once again to Ask WoW Insider, a weekly column that publishes your questions for our readers to answer. This week's question comes from Maedhras of Mannoroth, who wants to know the difficulty order of the heroic dungeons:
Here's the question that has me hesitating to take my friends into heroic instances.

What is the correct order of difficulty of Heroic Instances? Is it in any way related to their non-Heroic level (ie. Ramparts would be the easiest, with Arcatraz being the hardest?) (I shudder at the idea of the 2 Sentinel pull in Heroic Arcatraz). From what I've heard, the non-Heroic level is no indication, but I've been able to clear ramparts (what a scam btw, the last boss does not give a badge) and got my buttocks neatly handed to me in a Red Gift Packaging Ribbon in Steam Vaults.

So what's the dealio?

Also, where does Kharazan come in, difficulty wise?
Which heroics do you find the easiest and most difficult? What would you suggest for players just starting out doing heroics? And relatedly, which do you find much harder than their normal counterparts, and which relatively similar?

Got questions? Hit us up at ask AT wowinsider DOT com, and we may just publish yours next week.

This article was originally published on WoW Insider.