PA should give fluff stats only, like mount speed, swim speed, extra damage on Rift creatures, the teleports/summons/some weapon enchants as it already does..BUT ONLY FLUFF STUFF.
Instead it gives those and very important stats which is the main problem.
Its based around grinding, which isnt bad, but the main problem is, it makes an already unfriendly alt game, even more unfriendly.
Wasting time on an alt, means hindering progression of your main character and in the end of your guild, simple is that.
The XP gains arent done properly, its better playing solo, that being grouped for maximum experience..The changes to IA helped, but still certain classes grind faster solo, than IA, EI IA might change that, but shall see.
Overall the main problem with PA:
Gives way too important stats and makes alts INSANELY unfriendly.
XP gain should be ACCOUNT WISE, and the stats should be usable once, same with the gains.
Have 7 Gains of Marks per character, but only 7 gains (Plus the refresh per day obviously) of XP per account, same with any high XP quest.
As example, PvP daily, Favor/XP/Prestige:
Done on Main? :Favor/XP/Prestige
Done on alt:Favor/Prestige
Few weeks after when main doesnt need favor and prestige anymore?
Do on alt:Favor/XP/Prestige, allocate the PA stats where you want, on alt or main.
Same with PvE, my main does not need anything in the game apart from the Rogue neck from Akylios, (MM spec wise, when we might get more one hand drops i might need the sword also ;D) therefor any Plaque's or Marks, are useless.
When i leveled my alt and started playing him, PA was introduced, i simply abandoned the alt because any time wasted on the alt = PA gain on main because i dont log much apart from raids.