Okay, here's my MMO thoughts to date. For what they are worth. By category:
Best graphics - Beauty of each zone, npcs, spell effects and game sparkle
AOC - (Requires very high comp to see graphics fully)
LOTRO -
EVE
Best PVE - Solo PVE + Group PVE - Non raid specific, questing & small groups
WoW - (great lower group content)
LOTRO - ( lots of cool pve solo content)
Vanguard -(huge number of quests, and different areas)
Best PVP
DAOC - There is no other to compare - but War will rival it hopefully..it's called RVR
Eve - I've heard it's amazing, so throwing it out there. Haven't played.
Best combat
AOC - By far the most complex and exciting combat system in any MMO.
Vanguard - Awesome classes which made combat very fun.
Not best but to mention:
DAOC - Group oriented combat that required a different dynamic.
Wow - Very easy to play and master
Best Immersion
EQ1
Vanguard
Wow
Best Classes
Vanguard - They must have spent all their money on their classes. Simply amazing.
DAOC - I just loved them - prolly some bias for me here.
WoW - Unique and easy to play
AOC - subtle, and unique
Best group Dynamic
DAOC - You rely on other's completely, changes the entire genre of mmo's
AOC - Similar feel
Most MMO's are solo oriented. These aren't.
Best raiding - PVE
WOW
EQ1
Best Raiding - PvP
DAOC
EVE
So, pick from these, you can see I haven't played them all, but these are the big guns in MMO world atm(or recent past)
Hope it helps