It is true that Guild Wars 2 has drawn many players' eyes since its release. When asked about which profession you like best in Guild Wars 2, there are different views among Guild Wars 2 players. As far as I am concerned, there are 20% players like to play the Mesmer in a vote. They think it is a profession which hardest to play.
While some others hold that Engineer, Necro and Elementalist are harder than any others.
I have played the Mesmer and Guardian in the game before, and however if I only have to pick one, the mesmer is hands down the best all in one profession for me... fast combat, tricky, cool weapons skills.. Great survivability and a nice set of utilities.. It makes my day every time I log in PVE or PVP.
It goes without saying that the popularity of professions is not the same as the fun factor. In conclusion, with different skills and races, or money spends on Guild Wars 2 gold , we are definitely having a special game experience.