Its not just skyrim thats suffered this fate, alot of video games have slipped in recent years.
Lets look at cod eliet quickly, when it was released you had to imput your dob so it locked out 75% of activisions customers, 'luckly' as online is not rated they just stripped out the age test. This massive customer base cant be ignored but when they are aiming/altering content at that audience insted of the intended audience its a bit of a back stab.
Skyrim imo has had some similar design problems that i dont think are just about aiming for new players, but younger players.
For starters:
Dialogue in skyrim is poor, really empty in some places. Space maybe an issue for audio, so this may be exscusable, but not how childish it often sounds. That said with a text bases replys system there is no reason to not have variable or interedting retorts, in game they are very short or non existant. NV imo showed of good varible dialouge that didnt seem jarring that it often led down to the same out come. This illusion of interaction and sway on the world is important imo.
Tes(and fo) makes great use of text, be it notes or quest books, but now they are rarely lengthy and the journal has been reduced to a list?!(you want streamed lined, thats fine. Try more tab/pop ups, what ever, just dont leave it all out...) oh as for puzzles?! match the pictures?! i just bought my brothers three year old son a book with the same mental strain as the skyrim dungeon puzzles...I know they are new and no one likes being pointlessly stuck but seriously afew teasers or latteral thinking puzzles would not have gone amiss!
I wont touch on spell making or repair or any of the other features that have had alot of air time, i believe the words in beths rpgs are what holds alot of its substance, outside the gameworld, its self, alot of the features beth use are no way ground break, they need this intellectual high for there games to truly get back there old life span and prestige of 300hrs+(more like 1000

Hopefully we can see what beth are really capable of once more with some serious dlc, because Im fed up of really looking forward to what is apprently going to be a mature exsperenice, completly flattened by a lack of in depth elements and generaly pooh-poohing of text and speech, and real depth and maturity.
And know i dont mean it 'dont have enough blood, briasts and swearing init.'
Im going to have to start renting games again to see if the target audience is the same as there rating... Please Bethesda there are few good games companies left. I wish you had a more open repore with us here on the forums, i know there are alot of voices and some shout really load, but when alot of those voices have agreed and are passionate about it, it would be worth, at least, saying if you agree or disagree and why you think so.
EDIT: Hope this is better.