I’ve been playing three weeks.
I find the Guardian and Warrior very easy to play so far. They just work. Simplest game mechanics.
The Ranger is also easy and durable, and I found the Signet of the Hunt which gives 25% movement speed increase very handy (as I spend less time getting about). Right now he’s my main and without too much time got to 37 in that three weeks.
My spell classes (Mesmer, Elementalist) are a little trickier, so I wouldn’t recommend them.