The event was annihilation i think shane? Not sure but that is what I remember. And i do agree that it was fun for us. I mean, that was an event where I can use my wizard decently.
Now for the snipers/gunslinger issue. Back when we only had elite weapons, those 2 classes ALWAYS had no shield, and it was not an issue really. I respected a few snipers back then(iHunt comes to mind if anyone remember him, Kuoch as well) due to them being able to pvp while switching to dagger+shield when needed).
And as Shane already said, bg is a team game. You are not supposed to be alone in it and expect to win. With no custom items and is only using valk/diabolus sets and normal accessories, no class should be OP against every class.