[MENTION=17929]sephi22[/MENTION] & [MENTION=11419]Ex0dus[/MENTION]
to be fair there is no easy class in Diablo and the templates are bought over from Diablo 2.
Monk = Paladin,
Barbarian = Barbarian,
Necromancer = Witchdoctor,
Assassin = Demon Hunter,
Sorcerer = Wizard.
Your advice for noobs to start with a ranged class is redundant, all classes have their own learning curves and play styles to master. On harder difficulties, ranged classes can get swarmed and die again and again. Don't even get me started on the immunity type monsters. Nothing i hated more than a magic immune mob when playing a sorcerer in the earlier games.
It's the balanced classes that are the easiest, classes that have abilities across the boards. In D1, the rogue was the easiest class, since every class had access to magic and spells in the game. The diversity of the rogue meant that she did not suffer from the melee restrictions of the other classes. You could keep a few staple spells for the rogue and focus on the bow.
D2 had the paladin as the easiest class, it was good at melee, had options for ranged spells, had healing and defensive auras, could tank and could dish out horrendous damage with the zeal ability. It was the most boring class in D2 and i finished the game effortlessly with it. Paladin was the only class that had no problem soloing the entire game and difficulties in D2. The other classes primarily the sorc and necro had to be piggybacked a few times and had to have excessively developed skills and strategies to counter enemies in the game.
In D2, late game the sorc and necro were beasts, the amazon was a joke, assassin and druid were always a challenge, paladin was like playing on very easy mode.
From my experimenting with the classes in D3, Monk is like the paladin, super easy mode. Doesn't mean inferno wont be a challenge but not as much as the rest of the classes. You'll always find to be the easiest what stays with your style and process. I favour casters because i always analyze the environment, the enemies and like to have a plan before going in. My cousin would always play a rogue because he loved keeping his distance and playing a kiting game. Another friend of mine can't play anything other than a tanking melee class. He sucks at all of the rest.
So pick a class that you enjoy, you'll focus more on it and master it quicker.
And if all else fails pick a monk, can't go wrong with a monk.