I've been thinking about everything that Skyrim has to offer; (obviously this could be broken into hundreds of sub-categories)
* Visual & Audio experience - Graphics & Sound...
* Gameplay & Mechanics - Including new Character progression, New radiant AI, New Skills/Perks etc
* Story - This includes the main quest and side quests. Well written? Fun?
* Ambience - Surrounding events that occur. The 'real' world being alive in the background.
* Game Evolution - Progression from Oblivion
Most of this will be subjective. The ambience for example, I think it's quite well done, with a busy background world going on and I think it's achieved this. Others may feel that it's quite scripted and not very sandbox like.. however they prefer this and they're happy with it.
Curious as to the overall consensus when you're forced into a positive or negative response.