I've tried creating AVCHD DVDs as you did in your post. It is true that using VW to render to "Same as Original" does yield video with a 60 fps frame rate. For me, those mp4s that VW produces (using HW or SW rendering) do play smoothly and look pretty good but do display a quality loss. Here's a sample, I notice a fairly obvious pixel "flashing" (look at the trees as the video plays) whether I play this in MM, VLC, QuickTime, etc. Do you see this as well?
I created a number of test AVCHD DVDs using the "Same as Original" video from VW. I used source rendered both with HW and with SW (the Graphics Test always chooses HW, BTW). I then created the DVDs using both HW and SW rendering, using the "Same as Original" setting in MyDVD. In every case, the video was re-rendered. The final output exhibits the same jerkiness (it's as if frames are missing, the motion jumps from scene-to-scene and you can tell that frames are missing). This is very noticeable watching the woman and girl walk through the first sample file that I uploaded for you guys.
When using the "MPEG-2 High Definition 720p" option on the "High Definition" menu to output from VW, the resultant file quality is excellent. The "render" is very quick as I believe it is just going through and throwing out every other scene to yield a file with a 30 fps. Take a look, appears to be just like the original (to me).
What I'm finding is that, with the exception of single m2ts files, MyDVD re-renders every type of video (from VW) that I throw at it. When it does this, it introduces the "jerkiness/uneven motion" that I've mentioned. This can be seen when I play the AVCHD DVD in my Blu-ray player.
I can't find an output type (from VW) that won't get re-rendered in MyDVD. Does anyone have any info on this? Is there any format that I can create with VW that won't get re-rendered? What are the specs of what it's rendering to when I use the "Same as Original" setting in MyDVD, does anyone know?