I think the one thing that TES games suffer from has always simply been: The Open World Incentive
To expand upon this point, Skyrim's absolute greatest achievements are all numerous things that don't involve the actual game play itself. Its a fairly good game, don't get me wrong, but I get the feeling some IGN reviewer played the game up to the very first Dragon cinematic, blew a load in his pants, slapped his desk and yelled "SOLD!" aloud.
Lets get back to "The Open World Incentive".
What is it? In a simple way to explain things, It's the incentive to simply bask in and interact with the world manufactured before you. This game should be called, 'Elder Scrolls V: Revenge Of The Caves... Oh.. And Theres A Dragon Or Something..'
There is such a beautiful world! I had my sword ready and ready to conquer the piss out of it!
NPC: "It seems I have lost something in a cave.. could yo.."
ME : "DONE"
NPC: "We need to thwart our oppositions defenses, for some reason the most effective way to do this would be asking you to find something in a cave.. perhaps solve a door puzzle or something you will see multiple iterations of in the future"
ME: "Ehh.. okay.. sure"
My post in a forum regarding the issue: "Geez, there sure are alot of caves tied into the story and the related arcs.. does it lighten up?"
A response later: "Well, if you don't like the caves in the main quest arc, you can always go explore the unrelated caves"
So my first character is almost 50... needless to say, I'VE SEEN A PISS TON OF CAVES. You wonder why this game is 6gigs? Clever compression? No, limitless endless caves and tombs. Most very similar in style. For the sake of file space, I would go further to suggest that these caves are very similar if not replicated in some areas, but I wasn't paying attention at the time. I was too busy being pissed off in a murky cave.
So we have this amazing world to explore, but almost every interesting quest arc sends you into a cave or ancient tomb. You should also notice that the environment outside of major cities is fairly sparse with living inhabitants. The excitement of exploring the world is somewhat dwarfed by the fact that you won't encounter much anything of interest, short of the occasional bandit camp or CAVE.
As a legendary game, I was expecting to interact more in the cities, do something daring and adventurous. Experience more outdoor content and battles.
The next biggest glaring bane on this game is easily the most overstated. The unquestionably brief main story arc
I had a habit in older TES games to save the biggest prize for last, but once coming to the realization that they were all so painfully short anyway, I want ahead and got this all over with earlier in the game.
It was an epic arc, but unbelievable short. It introduced you to some great environments and threw some really cool themes your way. Playing a game bolstering this awesome pace in scenery, dialogue and plot would be an ABSOLUTE gem. IF they were able to maintain the pace for AT LEAST 30hours of gameplay.
This is what absolutely kills the motivation to go on about the world and it's activities. Because no side quest, guild arc or mundane searching will come even remotely close to the few few hours spent on the main quest. Your alternatives are: Repeating very mundane guild quests(FUN), exploring more caves(JUST AS FUN) or doing some stray npc assignments that ultimately involve.. more caves.
Then again.. you can buy a house... that you can't really customize.. and acts as a glorified storage box that you can also happen to sleep in.
Aside from bugs and nasty UI issues, you also have to look at:
Very poor mob variety. Literally 90% bears and humanoids with the occasional dragon flying around. The mobs aren't half as varied or half as visually threatening as say Morrowind.
Poor item variety. I'm using some Nightingale pieces and some thief guild pieces. No amount of searching or exploring has yielded ANY interesting replacements.
Which leads me to:
Punishing exploration. Like someone stated before, you will always find 9g in urns and jars in an area where you are killing people for 70-100g drops per. I haven't encountered a situation yet where my "exploring" has ever paid itself off. So I'm to explore and search caves and run errands knowing nothing will replace the build i have now? Or amass a fortune of gold to spend at vendors who always have a very poor stock, with items that seem to be a good 10 levels behind me?
I expected at least like one overprice vendor with some gear on a level that could at least contend with mine, but no...
I have no reason to "want" to explore the game after the main story because it yields nothing particularly interesting or lacks the ability to introduce something you have seen several times before.
No rare cave demons, no mythical forest giants, no 30 foot abomination.. nope.. just bandits, wolves, bears and bandits.. with the occasional mage or spider thrown in there.
If the main quest was satisfied and you brought down the baddest of the bad, then I could understand mingling in the world, pursuing goals that actually affected the game world. That is my concluding argument.. You never feel like you are helping to shape the world around you or even influence it. Even though you will have all manner of npc's "affirm you ARE dragonborn(like thanks dude, i never noticed) and killed some badass dragon, you sort of feel that Skyrim would just along fine without you.


Take that.