The mesmer is a very capable class in solo PvE. Dropping your clones/illusions and then going invisible will make your opponents focus on your clones/illusions. Depending on your traits, you can have 3 clones/illusions up pretty much all the time. Using both decoy and the #4 torch ability resets your aggro, and pretty much every time you regain it, the skills are off cooldown again.
Combine it with a signet of the ether, just as an example, you are almost always at full health while not even being the primary target. This whole thing doesn’t even take skill to play. You just use a normal rotation, and even most champions become a breeze. The only problematic enemies are those that can one-hit your illusions/clones.