These are some things I've seen and liked in some MMO's and would like to have seen in other MMO's. The last one is something I have come up with and haven't seen in any MMO and have always thought might be cool to see in one.
1) Subscription payment model no cash shops. (Will most likely NOT play this game if it is free to play with a cash shop) Did too many of those and will not do them again. I'd rather go back to WoW or stick to single player games.
2) Have 3 head slots. Top of head, eye's and mouth. At least for cosmetic features.
3) More than 6 boring armor slots. I would like to see at least twice that.
4) More than 2 boring cosmetic slots. I would love to see Top of head, eye's, mouth, shoulder, back, chest, gloves, belt, pants and feet. Almost like Morrowind with its clothing in the game.
5) Would like to be able to use armor gear and clothing for cosmetic slots.
6) Player housing with storage.
7) Mounts that don't disappear when you dismount.
8) Mounts with storage. (Saddle bags) Though i hear they already have that.
9) At least 90% of all in-game items to be player crafted & some sold in NPC shops.
10) Would like to see many professions and allow us to do as many as we want. No limit like only 2 or 4 professions per character. I want to do it all on one character.
11) Non-humanoid monsters shouldn't drop gear. That’s probly how its going to be as in the single player ES games.
12) Dungeon and raid bosses shouldn't be gear runs. No gear drops in dungeons and raid. Don't want the ESO to be a gear run game like WoW. (From what I’ve read it’s not so that’s good.)
13) Just one (1) currency. Sick of games with regular currency, multiple faction currencies, pvp currency, all we need is one type for everything. Currency should be like they were in the single player elder Scrolls games.
14) Not be allowed to be mounted near any NPC, mailbox, shop, auction house, bank etc.
15) Buy or build small or large boats. Small fishing boat to fish on or cross rivers. Large ships to sail the sea's. Sea battles or sea trading.
16) No gear from quests. Should be reserved for player crafted. And humanoid drops.
17) Would like to see many repeatable quests. Not just dailies.
18) Would like to see areas in every zone that have different leveled quests and monsters. So zones don't become barren and a waste of space where no one goes to anymore.
19) Have many factions to do quests for and gain rep and ranks in. like Morrowind did BUT MORE!
20) A good quest tracker so we spend less time alt tabbed looking things up and more time playing the game.
21) NO follow command. No stupid multi-boxing.
22) No limit on how many daily quests you can do. just the limit of one time a day for each daily.
23) Multiple factions of the same faction type that are at odds with each other and you can only join one of them. (I.e.) 2 or more warring thieves guilds, fighter’s guilds, mages guilds and warring faction houses. Faction houses you could join more than one just not all of them. Maybe add a way to switch sides with a long quest chain or something for achievements. Could even add a PVP element to it. Where some quests are from NPCs that offer PVP quests where if you take them you are PVPed only to players in the opposite warring faction than the one you’re in.