I might be painting with too broad a brush, but there were probably several issues that Bethesda was wrestling with prior to game release day that ended up biting them in the a$$ets, PS3 debaucle was only the most obvious. Frankly, they should have had 4J studios working the coding seperately as the game came together. Sure there were some singular bugs with their work of Oblivion, but it had none of the game engine lag issues we saw repeatedly develop with Bethesda's in house handiwork with Fall Out and Skyrim.
The use of random quest generation was initally going to be the main foundation of the game, which would have been a disaster IMO. Bethesda had to change directions midway, which explains why most of the questline adventures ended up being short, often shallow, and sometimes totally full of plotholes. Not enough time was allowed to develop the game story aspects, only the game world design and sound track really seem really hit their marks,, though I'd also give kudos for the improvements in the combat and magic system mechanics. I'm really hopeful they move more to a narrative style ike we saw in KOA,-Reckoning, which was more faction oriented like Morrowind.
Skyrim made Bethesda a lot of money, but it was also a huge monster of a job for them to deliver it on schedule. Hopefully they are expanding their game development period this time around to be more realistic with their aspirations. They've also a whole new console architecture to be working with this time, so there are some serious challenges ahead. And while I'm fairly confident they'll deliver another blockbuster gameworld adventure, I'd not be surprised if its just a bit smaller in scope from previous releases. I'd glady accept a province 2/3rds the size of Cyrodil or Skyrim, if it meant we received a gaming experience that had some depth and dialogue to it, and only the occasional small bug issue. And to wrap it up I'd say , they shouldn't announce a release date until they are at least 80% done with the game. Their games are just too complex to slot into a hard and fast workplan. Let the artists at Bethesda strive for excellence this time, and if that means extending the development window 3 - 6 months, fine, I'd much rather have a quality game than one that is rushed and gimped, just to meet a corporate monetary timepoint. There would have been a much higher aftermarket accessories (DLC) return if there hadn't been so much fixup work going on instead. Pretty obvious.