Confirming that Mesmer is a slow-burner that only really starts to shine when you get into the Traits (I’m now at 32).
Definitely my favourite Profession so far (and that’s saying something, since I’ve enjoyed all the other classes I’ve tried so far too).
It’s not a pet class, you have to get used to thinking of your illusions as disposable - Clones are basically aggro management tools, Phantasms are like DoTs, shattering is burst, with ancillary effects (which are quite important and situationally useful). Phantasms add a LOT to your damage, but they have such a long delay between their initial attack and their second that it’s probably not worth being precious with them either, just shatter them after their first attack, and summon more. They can be traited to have a faster attack, then I guess you’d think about keeping them up more and keeping the aggro on you (clones keep the aggro off you, but if you’re going to rely on phantasms for dps, you have to keep the aggro on you).
Mesmer has a ton of micro-management, but I like that. I always say, I’m not the sort of player who will use one keypress to kill a mob when I can use half a dozen keypresses to do the same job :)
Every MMO has to have a class or two like that - micro-management intensive, lkeypress intensive, has to be situationally aware of the battlefield, etc., also capable of filling lots of different roles (you can even tank tolerably with a Chaos-oriented Mesmer).
Staff seems to be the most useful all-round weapon, and it has some wonderful graphics/audio fx attached. Sword+Pistol seems to be a generally favoured combination for secondary weapon, for PvP especially, because of the pistol stun; but all the combinations work and do something interesting and potentially synergistic with various combinations of traits - it just depends on your playstyle and the circumstances.
Recently I’ve even been getting into the Mantras. They make you more of a traditional Mage, with spells that you prepare beforehand (except you can charge them up while running) with proper “magic spell” fx. Again, you could trait into a Mantra based Mesmer, or Sigil based, or Shatter based, or a more traditional Healer (Inspiration tree) … so many options.