and turned into 100 reasons why invokers are overpowered and can not be defeated by non-rager warriors.

I've played an invoker, and I've played a warrior, and I believe you are misrepresenting both classes. As a non rager warrior, I never felt that one invoker, alone without any kind of backup (eg out of range healer helping him), was any kind of threat insofar as actually killing me, unless he was Ehren. As an invoker, I never felt that one non-rager warrior, alone without any kind of backup (eg out of range healer or invoker helping him), was any kind of threat insofar as actually killing me. But, while playing either class, I gave 100% of my effort to solving the "puzzle" of how to narrow down the opponent's options and nail the kill.

Cathoir asked why the playerbase seemed low on the PK knowledge scale to him, and I wonder if the answer doesn't have a little bit to do with the seemingly popular opinion that invokers are sick and wrong.

Do you want a con for the invoker?

They have no dodge, no shield block, and can only parry three weapons (two of them useless - dagger and whip). They rely on highly-limited preparation items that are a challenge to acquire solo and for which they are in competition for with the rest of the mage playerbase. They also have little room for error and can not afford to underestimate situations or opponents, or there is a good chance they will die.

If you take advantage of an invoker underestimating you or the situation, you win. Being able to do that somewhat reliably is having Cathoir-style PK skills.

PS - Yes, I qualify getting Dullameh to stumble into one of your briars unprotected under a full moon as PK strategy. Ideally, if you're facing quality opposition, they're going to learn from their mistakes and you won't be able to reproduce a "trick" reliably - if you are reproducing the same trick over and over to a witless foe.. isn't that a little boring and unchallenging?