Part of me wonders what would have happened if MJ had created Imperator and not been bought out by that destroyer of game companies, EA....Every time I want to curse at MJ for Warhammer, I just watch a Barnett video and realize greater powers than MJ fucked that game up.
Third party licenses generally ruin games. Mythic/EA should have just did what Blizzard did. I'd say 95% of Warcraft is lifted almost verbatim from Warhammer.
Anyways, MJ was not in control with the EA overlords. Brad completely ran the shop at Sigil, correct? If half the rumors of the fake tech demos are true, then I'm not sure how anyone can compare the two.
Best PVP game by far was UO. However, it was also excruciating at times with the reputation system, exploits, and bugs. Most challenging and fair PVP game would be DAOC. It's design remains the best, in my humble opinion for people who like both PVE and PVP...