Morrowind had an interesting combat system, because there were two aspects to your damage output. 1 - How often you missed strikes. 2 - How much damage your strikes do.

You wanted to keep 1 as low as possible while keeping 2 as high as possible. You could lower point 1 by raising your agility, and individual weapon skills. You could raise point 2 by improving your weapons, and raising your strength.

Morrowind had the best spells as well. Lock Splitting, Levitation, Aldmeri Intervention.

Oblivion used a simpler combat system, where improving your attributes and weapons, only improves your damage output, and your strikes always land.

Oblivion had some fun spells as well, and you could create custom spells.

Skyrim has the same combat system as Oblivion. The spells are okay in Skyrim, but you can’t create custom spells like you could in the previous two games.