Guild Wars 2

I think mesmer as a class at the moment lacks build diversity for tPVP. A few tweeks here and there can probably greatly enhance several builds that could have been viable but not at the moment.

Mantra build:
Biggest problem with mantra build at the moment is the 4 sec channel to recast the mantra. There is also the issue that other then Mantra of Recovery, the other mantra are not good enough to outweigh the drawback.

This can be address in a couple of ways:
Existing traits can be modified to address the short comings or mantras themselves can be improved to make them attractive to use, or a combination of both.

For example, Empowering Mantra, being a grandmaster trait, is pretty weak and does nothing to enhance mantra build, I would change it to something like “Reduce Mantra Channel Time to 2 Seconds.”
Protected Mantra – Gain 1 second of distortion while casting Mantra.
These changes will greatly reduce the risk of channeling mantra.

For Mantra themselves, Mantra of Concentration -> Power Break can prob add 3 second regeneration on top of 3 sec stability (Thinking of Earth Shield here) -> allowing the chaos 15 trait to synergize nicely.
Mantra of Pain -> Power Strike can prob add might on top of pure dmg.
Mantra of Resolve -> Power Cleanse can prob add Vigor.
Mantra of Distraction -> Power Lock can prob add weakness or vulnerability.

There is also Glamour build: (For better team support build)
A few trait tweaks:
Dazzling Glamour could cause blind to anyone in the effect the field or enter/leave the field for the remaining duration of the field rather then just 2 sec for those that the field is casted on. (Combining effects from this trait and Confusing Enchantments) So if a field with 6 sec duration, those initially hit or enter/leave will get 6 sec blind, 3 sec later, anyone moving into the field gets 3 sec blind (remaining duration of the field.)
Confusing Enchantment could have same type of effects.
Temporal Enchanter could extend the duration of certain glamour longer then others (percentage based as suppose to flat 2 sec). 6 sec to 9, 4 to 6, 8 to 11.5, etc.

Fixing some of the support skills such as phantasm granting regen, increaseing range of restorative mantra, vigorous revelation and Phantasmal Healing, etc will also help diversify builds.