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Out of everything that i've leveled to a substantial level (50 or higher) I would have to say that none of the classes were "hard"

EASIEST
But my PRIEST was the hardest I've had to level.
I leveled her as Holy. Strictly Heals. Don't ask me why, i was very much anti shadow (and still am, it is just not for me.) and didn't know about disc and was a little scared of it.

Not only are they healing mainly but they are clothies. They pretty much have no chance against any thing of the opposite faction (except other healers, or priests) unless they are disc. And even then if they aren't pvp experienced things will still whoop their a**. it will just take longer. Also, Holy priests have it rough raid healing. They have superior raid heals but tend to go OOM quick. (i myself have converted to discipline and I absolutely adore it.) Discipline heals are great but a lot of guilds shy from them and say that they are not raid viable. (which is false. Disc priest heals are extremely similar to holy paladin heals. AKA Single target damage mitigation/reduction heals.) Another issue with Disc is it is VERY gear dependent. If you don't have substantial spell power you will have a hard time seeing any kind of effective healing. (holy has talents for extra spell power and mana reducing things etc etc. holy is very easy to do in blues.)

And like a lot of people have mentioned Healers. Get blamed. FOR EVERYTHING. tank can't keep aggro? Healers fault. Tank is horribly geared and gets 1 shotted? Healers fault. DPS are idiots (<- most common, lawlz.) and don't move out of void zones, aoe, clouds, blah blah blah, whatever. Healers fault. Doesn't matter!

TL biggrin R
Healing Priests are the hardest.(In my opinion and in my experience)
Suck at dps.
Suck at pvp.
get blamed for everything. (QQ)
can hardly quest on their own.
Spec issues.




EASIEST CLASS TO LEVEL:
from MY experience is probably my hunter (she's 72 and was my first 70 i just got bored and never went back after my priest. sad oh well.) or my paladin(lol80ret). My hunter was just BM. Auto shot. send pet. Bestial wrath. AFK. it was simple. And also, whomever said hunters are hard to play, that is nonsense. If you're BM, rogues or any stun classes will not give you ANY problems (assuming you can output the dps in 15 seconds to do significant damage / kill them before bestial wrath runs out.)

Paladin was super easy because she just raped everything. It didn't matter what level or how many. SHe just ******** everything up. It was fun too because I wasn't worried about pvp up until 80. I guess i was a little cocky, lol. I could kill ALMOST ANYTHING that was in my way because pvp ret is op. Or rahter was, until today, when the patch came out and they nerfed pally burst dps. /sigh. oh well. lol


TL;DR
Paladin and hunter were eazymode.
Paladin:stun any opposite faction. rape.
Rape mobs. win.
Hunter: Auto shot/hunters mark. Send pet. Bestial wrath. GO AFK.
WIN.


the other classes I've played(Warlock;63, Shaman;64, Druid;50.) The warlock was easy but i got bored. Shaman was fun but a little annoying to level as enhance pre40 as i would take a lot of damage in leather and there was a lot of downtime to my leveling. (i had to drink/eat a lot) Druid was extremely annoying and hard until cat form. Then it wasn't bad, but i lost interest. lol.