Firstly, I'm 6 months in and have almost 1000 hours under my belt so, this game must be awesome. Took me a while to get over the major differences from other ES games though, I understand some of those decisions but not all. To start with just the things I'd like to see added.

1. More Classes, I specifically request a "Necromancer" class, I think Tharn proves that necromancers don't have to be purely antagonist. Also you could totally summon the dead in ES 3, Necromancy wasn't banned until ES 4. A quest line for them would be nice too.
2. Ship Housing (specifically pirate based, bonuses if you can move or access in different harbors).
3. Pirate quest line would be much appreciated too
4. Costumes facial/hair dye so you can change your characters hair color
5. more wayshrines in cyrodil. Sometimes you just want a way to leave because you weren't there for PvP

Here's some of the differences I don't understand

1. Stealth and Bow nerfed compared to other ES games (I don't expect this to be as effective in PvP ) but I kind of miss being able to oneshot a PvE antagonist from across the "delve" in first person mode. Also I think the bow animations look rather ridiculous.
2. No underwater! where's my grottos, why can't I kill those damn slaughterfish!
3. Acrobatics? I miss thee (would love an acrobatics skill line)

Paywall gripes. I'm a Sub, I bought unlimited/gold/morrowind over thanksgiving sale, and I've bought crowns in addition for the collectors editions of DB/TG. I'm not against paying money for things, here's what annoys me about this though, and seems kind of greedy vs we need to get paid too.

1. I'm a Sub and I still can't play the imperial race? really? couldn't this be included as a "DLC" I know it's not in that section, but still. Honestly I think this should just be moved to the base game now.
2. why doesn't buying chapters/dlcs/unlimited come with some "free trial" subcriber time/crowns. Seems like a week and a handful of crowns wouldn't hurt much. Probably just encourage more subs since people could then see the benefits it gives for cheap.
3. Let people renew subs early, if you want crowns via extended subscription why not, you ZoS just got a loan that can earn ahead of time interest.
4. unlimited free appearance changes but only during the "tutorial" part of the quest that you can skip. Once you've completed it appearance change costs money. Really this is all about sometimes you just can't hear all the voices, or see how the character looks in varied lighting during creation. Bonus points if changes could now be done in game instead of only at the character creation screen.
5. I was going to buy copies of Tamriel Unlimited for some friends for $10 the next steam sale, but guess what? you apparently can't buy just that anymore. Buying 3 friends the game for $30 total vs 3 friends for $90? uh how bout no. Hopefully the price of morrowind goes down to $10 when on sale when summerset is released.
6. (ok, here's my never done idea that I think would be good idea, but maybe it's not) don't buy a month worth of access that's constantly burning, buy a "month" worth of playtime that only burns down when you're connected. Similar to how AWS only charges for servers when your server is spun up. This is just an idea I've had, and't isn't specific to this MMO