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Daisyx

This thread is going to be a comprehensive look over time to see which types of PvE trinkets have often been used in pvp, which design flaws these trinkets have in common and what can be done to make sure this doesn't happen again in the future.

The scientific data

As a scientist myself, I can say that this survey was done in an entirely unscientific way: the only person interviewed for the perceived ''overpoweredness'' of trinkets was myself, also I started my ''research'' with the assumption that a certain species of pve trinkets were overpowered and I found the evidence to support this claim, so it might be slightly colored.
Because I am the only research subject, I may have forgotten, overlooked or generally missed certain trinkets, feel free to correct me if I am wrong.

Who am I?

I have been involved in high-level pvp since about~s3, I have gladiator in s3/4 and have had the ''junkie'' status on Arena Junkies for the entire TBC, WOTLK & a big chunk of cata. On this shaman I am currently sitting a 2500 team, which should be gladiator or very close.
The above was not stated as bragging, however it is a statement as to why my opinion is relevant on the subject.

The research parameters

For this review I have chosen the following trinkets: Every trinket which could be obtained from a raid in the seasons 3 to 11. This means all the trinkets are from SSC/TK or higher level raid instances. If there are multiple versions of each trinket avaible, I have put the best one on the list for the purpose of being able to compare them.
For this review, I have chosen only to focus on rated arena, simply because rated battlegrounds (introduced in s9) are more group oriented and therefore leave inherently more room for PvE items to be good. However, for RBG similar conclusions could be drawn
I have used the following methods of obtaining a list of trinkets: wowhead searches with the following parameters:
http://www.wowhead.com/items=4.-4?filter=cr=148:149;crs=-2323:-2323;crv=0:0;ma=1;eb=1 (for all the post-TBC trinkets)
and http://www.wowhead.com/items=4.-4 filter=qu=4;cr=16:16:16:16:16;crs=3959:3845:3607:616:4075;crv=0:0:0:0:0;ma=1;eb=1
(for all TBC trinkets from SSC/TK/BT/MH/SWP)
I have also included 1 non-raiding trinket simply because I remember in being so overpowered.
The reason why I don't touch on dungeon, valor or Darkmoon Faire trinkets is because they are easily available to all players and therefore, while they could be overpowered, don't tend to cause as much of an imbalance.

The trinket review

This review will start with the lowest Ilevel slowly working my way up to the highest.
Next to every trinket I will state if it had an effect on competitive arena and if so, why this was.
After this list I will point out which type of trinkets tend to cause the imbalances and which design decisions blizzard should avoid making towards trinkets in order to have a competitive game.
There are 4 categories under which I will label the overpowered trinkets:
1. Class mechanics: this means that a trinket interacts with a certain class mechanic very well and therefore enhances the specific class alot
2. Damage procs: this means that a trinket has the ability to cause damage as a chance on hit, this often causes alot of burst in pvp making these types of trinkets very good
3. Haste-procs/uses: these types of trinkets give a temporary (on-use) increase in haste, making them very good for casters in pvp.
4. It has on-use damage or healing