I like having a storyline to follow in an MMO.
The first one I played, Asheron’s Call, didn’t have that. In contrast, the second one I played, Guild Wars, did and I really enjoyed it. I liked advancing the plot, I enjoyed the missions; same with the expansions Factions, Nightfall, and Eye of the North.
Fast forward a bit to LoTRO and it’s lengthy storyline. I love that. In fact I’m looking forward to starting on a new server and progressing through Vol 1 Book 1 to …checks wiki… The Legacy of Durin and the Trials of the Dwarves.
ESO also has a storyline, multiple storylines actually. There’s the original main quest of the base game (starts with Soulshriven in Coldharbour), a storyline for each zone, a storyline for each guild… plus the usual boatloads of side quests.
FF14 has a very long MSQ (main sequence quests) that leads you through the game. In fact you need to go through it to unlock feature like mounts, airship travel between cities, the ability to return to an aetheryte crystal, joining a Grand Company, the ability to swap classes/jobs… Heck entire zones are unlocked as I found out. I tried to run across the Dravanian Hinterlands to get into Idyllshire early to buy some armor, but that doesn’t work because you can’t get in until you, you guessed it, advance the MSQ.
Another MMO with a great storyline that I’m not currently trying to juggle into my rotation is Secret World, oops I mean Secret World Legends. I got stuck and couldn’t pass a mission to advance the plot and rage quit after trying a half-dozen times. Well partly rage quit – I didn’t delete my characters and then rant on the forums. I just stopped playing. Maybe I’ll try again…