It has been pointed out here that, as well as Skyrim, Oblivion, Fallout 3 and Fallout New Vegas all have microstutter. Personally, while I read all the forums for the previous games , I don't recall any microstutter discussions. There may have been but I never read them. The reason for that, I suppose, was I never had microstutter in the earlier games.
I ran Oblivion, Fallout 3 and Fallout New Vegas on an older iMac in BootCamp which had an i7/2.6GHz CPU and an ATI Radeon 4850 mobile GPU. Those games showed no stutter when clearly according do some statements here the iMac's weaker hardware should have had performance issues. I built a PC (specs below, except it had GTX 480s). It ran Fallout 3 and Fallout New Vegas without microstutter, as does Skyrim now. Heck, there was no microstutter in Oblivion on my very old Mac Pro which used XEON CPUs and a bloody awful ATI Radeon X1900 XT. I doubt microstutter is related to what GPU you are using.
I accept that the game engine is causing a stutter problem for a lot of players, or more likely, the engine is in conflict with
some players' hardware. As I've never seen that issue, I ask what's been different about my hardware both before and now? Somehow I doubt that GPUs (whether or not they are nVidia or AMD) are implicated. It looks more likely to be related to the CPU and we hear a lot that Skyrim is CPU-intensive.
So while the engine seems to be partly at fault, my guess is that using C2D, i3 and i5 and equivalent AMD CPUs is contributing. Note that all my experience above was with the i7 CPU — no microstutter. Maybe those using the listed CPUs are the ones with the issue. I am just guessing, but it would be nice to discover why some have microstutter and some don't. It could be the CPU.
I suspect that the devs mostly used i7 based computers or equivalent to build this game. Was the game ever tested in depth on other CPUs? Maybe Beth's Recommended System Requirements should be updated. But they wouldn't do that because it would cause lost sales. Back to you Beths, to make the engine run with lesser CPUs. They won't do that you know. At least four games are affected and they've never addressed the issue. It'll probably cost them far to much in an engine rewrite. Is the fix as simple as some suggest it is? If it was they would have fixed it.