Hello Everyone,
I've been playing this game for nearly six years. In that time, I've seen some really nice Quality of Life improvements such as the Sticker Book, the Armory, changes crafting such as Chromium plating as well as the Trial Finder. These are things that have made the game better.
I've also admired some incredible work on the new dungeons (best for any MMO imho) and the new trials which are also far more sophisticated than their predecessors. Although the Overland areas are not always a hit with players, I can't deny that zones such as Necrom are visually stunning and certainly a step above what you can find in the original base game.
The point I'm making is that there has been a general progression in the standard and quality of much of the content in ESO. You can play an early base game dungeon and a recent dlc dungeon and see an obvious difference. A returning player can be pleasantly surprised at being able to remake any item set to any specification for transmutes. And yes, horses can now swim.
Yet the returning players come back to the combat and wonder what the hell is going on. I have yet to see a combat change which significantly improved the gameplay experience or class diversity for any vaguely challenging content such as veteran dungeons and trials in PvE or general PvP.