I remember the PVP was pretty cool and it was one of the first games to have "flying" via gliding. It also made my gaming laptop nearly explode every time I played it.
It had some cool PVPVE where two teams zoned into a zone and there was a PVE target and you both went for it for rare spell runes and you could kill each other and stuff. Kind of neat face off type BG.
I briefly had the best ranger gear in the world because the one week lockout dungeon had a like 3% chance to drop any classes armor on boss kills and I happened to get 3 pieces and an extended bow (built in haste) out of sheer luck. Pretty sure they made it less RNG fairly quickly, but in the first few weeks it was pretty fucking bad.
The mass PVP was good but about 0.25% of the player bases computers could handle 150 people flying through the air spamming skills and shit on each other. I'm sure it'd do much better in a modern iteration.