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Having played all the classes to at least level 15 I will say some classes are by far easier than others to me in the early parts of this game. Obviously playstyles differ and one person will find X class much easier or harder than the next person. The overall concensous from my playthrough so far any everyone I have talked to ingame can say warriors are pretty much the easier class to play all around. This makes sense since ANET themselves have said it was one of the easier classes to get into and play.
For me I look at this like difficulty settings on a single player game.. In many games you have standard easy, normal, hard modes and this can fit that into this game depending on your playstyle and the class you play.. the thing is it will be differn't for everyone almost. Now I'm not saying the classes are "that hard" to play or anything just some I found harder than others especially when facing groups of enemies and especially in some of the personal story quests. Here's my list for standard PVE from my experience.. now obviously like I said some may find elementalist or thief or engineer to be easier for them and ranger to be harder just depends on the person and how well they know how to use the class and it's abilities.
Easiest Class for Me - warrior, ranger
Normal Classes- Necro, guardian, mesmer
Harder - Elementalist, engineer, thief
I will say if you are playing warrior and game feels to easy try an elementalist and see how that fairs for you. Again not saying difficulty will shoot through the roof or anything but as an ELE i found I had to be much more aware of my surroundings and how I was using my skills over how I played my warrior.
I angered the clerk in a clothing shop today. She asked me what size I was and I said actual, because I am not to scale. I like vending machines 'cause snacks are better when they fall. If I buy a candy bar at a store, oftentimes, I will drop it... so that it achieves its maximum flavor potential. --Mitch Hedberg