I was referring to the lack of depth to the mechanics.
1. Attributes are redesigned system maybe having a neutral perk tree tie into it.
2. The lack of old spell types and the lack of spell creation.
3. The exclusion of older weapons types, medium armor.
4. Long quest lines.
5. More factions to join.
I was referring to the mechanics of the game, not the quest lines.
Morrowind had a lot of flaws as a result of its openness. I actually don't think getting rid of stuff like spellmaking or medium armor was a bad thing.
I mean, am I sad that spears, halberds and crossbows are gone? Yea, those were cool. Having seperate skills for all of them was stupid though, it meant that a warrior either had to stick to just one type of weapon, or had to learn multiple weapon skills, which gave no benefit at all in a fight since you can only yield one type of weapon at a time.
Medium Armor? I really never understood that concept, even in Morrowind. I mean Ok, I get it, Medium armor is chainmail and such, stuff that isn't quite light armor, but isn't really a suit of plate either. Now that armor can be made weightless there would only ever be a point to medium armor if it had an entirely unique perk tree, and it's fairly obvious that they ran out of ideas for good perks with heavy and light already.
The spellmaker, I honestly find the spellmaker to be overrated. It gave you a bunch of ways to break the game, I'm honestly not sorry those are gone. The only thing that was really good about it was the ability to continuously improve spells you liked, or combine effects such as regen health and regen stamina into a single cast. The big problem with Skyrims magic is that some of the spell schools give you spells that do the same thing as their previous version, only slightly better, while others give you spells that work differently, while neglecting to scale the old ones. For example, if you are a master level destruction caster and you really like runes you still can't cast a rune that will do appropriate damage since it isn't a master level spell. That's something they could have overcome with more judicious design though. While the spellmaker was fun, it was more a source of gamebreaking exploits than real depth. There is damn near nothing you could make with it that wasn't game breaking that isn't in some way still around.
More factions and quests, well, that can be explained by text vs. VO, though people who say that VO doesn't allow for branching quests on a large scale have clearly never heard of a little thing called SWTOR.