On the topic, I wasn't too thrilled with the addition of Master System's Space Harrier 3D and Outrun 3D, they're not as fun to play (and to watch) compared to the superior 3D Space Harrier and 3D Outrun. Yes they are a different game, but why play the lesser version when you can play the superior version.
I think there are some good reasons. Space Harrier 3D is actually a sequel to Space Harrier. Inasmuch as Space Harrier has lore and a plot, Space Harrier 3D continues it - most notably because Euria, the friendly white dragon from Space Harrier's bonus stages, has been kidnapped following his ascension to the throne of the Land of Dragons, and it's up to Harrier to rescue him.
Out Run 3D is a great inclusion because it's one of the more rare and expensive Master System games in its original cartridge form.
Both are also notable because they're adapted from some of Yuji Naka's earliest work at Sega - the Master System's versions of the original Space Harrier and Out Run.
I think they're both technical marvels for an 8-bit system. If you directly compare them to the arcade originals, sure they're much more limited. But in the context of what was possible on 8-bit consoles at the time, they're absolutely amazing. Actually it makes me want to get an import 3DS and the physical releases of the 3D Classics series...