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The game lends itself to idiots making characters that are neither one thing nor another and will excel at nothing.
The holy trinity works well and pugs have a reasonable chance of containing players that at least know the basics of Tank, DPS and Heal roles.
In ESO players will experiment with silly specs, and when it comes to grouping, for the majority of players who are not going to be playing with friends, there is going to be an almighty mess with people not be able to fulfil roles sufficiently becasue of their silly specs that think are "sick".
Ah but the game has designed with that in mind so mobs behave differently I hear you say.
Well maybe but probably not.
a/ if no strategy is required because by and large all mobs are going to attack so it is a case of kill what you can.
Mobs will necessarily have to be easier to defeat without strategy because it wont be the stupid specs players choose that will get the blame it will be the game. That pressure will lead to dumbing down or empty dungeons. Play how you want .. remember.
b/ if a strategy is required the game will suffer because with so many varieties of attack and defence, pugs in dungeons are going to be a huge waste of time for most players. More than usual.
Players wont know how to play the odd spec they have created and other players in the team are not going to know how to get group synergy going because they cant possibly guess what crazy spec the rest of the team are using.
It is also not much fun because you know even less about what moves other players are pulling off and when during a fight.. thus reducing your interest and enjoyment in the team effort.
c/Do we get stats on players performance ? If not how do I know what you contributed to the group effort ?
In PVP. Zerg PVP hides a lot of sins. A lot of poor specs so that wont suffer from this aspect.
Organised guilds will have a better handle on managing players specs but it still wont be adequate.
It is hard enough running a guild without trying to second guess how effective a team member is going to be with his crazy spec ..until it is too late and you wasted a load of other peoples time and opportunity finding out.