Marketed != designed. Eidos sold it as a PVP game, but it was designed as a PVE game.
As for the raids, Vistrix was not tank and spank, the Champion wasn't either, just like Kyllikki, Sabazios (the regular tactics is not the "hide in a corner" one), Ahazu-Zagam, Seruah or Chatha (at least the first part.) And if we look a little after that, Athyr-Bast was definitively not tank and spank when we needed to wait for the guards' bubble to be available again (30 minutes back then.)
And i'll always remember the midnight update in the end of June/early July 2008 when they changed the Pyramid of the Ancients. I hit lvl40 just before the downtime :laugh:
Edit: In fact, it was June 12th, and it was the Treasury that was changed. Here's the
Update Notes thread.