Except for that, the mechanics have been improved in every way. Oblivion's magic system didn't have depth, it had clutter. It was awful. And as much as I enjoyed moonwalking with 100 Acrobatics in MW and OB, it cluttered the game and really needed to be removed or improved.
As far as your combat strategies, the Heavy Armor perk "cushioned" (Which I just got in-game) does a much better job of acrobatics for your strategy of dropping in and surprising them.
And while we're on the subject of perks - wow. They are fantastic. Not only do they give you the sensation of actually leveling up and progressing in game, they create an incredible amount of depth. And I mean depth, because there is a big difference between what Oblivion had and what constitutes an immersive game.
Skyrim wasn't streamlined and it did not become an action game, it was ORGANIZED and it has much more depth than Oblivion - maybe even more than Morrowind.