Man, these graphics are DAMN impressive for Genesis. They look more like what you'd expect from SNES...
Not really, Streets of Rage, looks the same more or less, it is the just the artwork, that is being illustrated. Another problem is the final product. So far we can assume, they are running this on settings, using more CPU power then needed. The demonstration showed, us sprites, so how much memory is being used for backgrounds, including the slow-down.
What sucks about the Genesis it has alot of power, but only few games took advantage of it. While the SNES survived on RPG's.