In Morrowind there's 8 armor slots (helm, curaiss, L&R pauldron, L&R bracer/gauntlet, greaves, boots). You can also wear clothing under armor.
In Oblivion there's 5 armor slots (helm, curaiss, gauntlets, greaves, boots). No clothing armor underneath.
In Skyrim, there's 4. (helm, curaiss, gauntlets, boots).
I love Skyrim but fuck me, it simplified alot, usually to its detriment.
Combat's fine. It works well enough. Nothing really bad, yet nothing really stands out. (For the love of God bring back hand-to-hand).
Essential NPCs are gay. NPCs should be protected from all outside damage (to avoid fucking with quests unintentionally), but should all 100% be killable by the player. No exceptions. Make for alternative ways to finish quests.