The SS mode is a little bit over the top. As a stand alone game mode, I like it a lot. But I also like my games versatile.
SS tends to overshadow other game mechanics. What use are some policy slots when you have so much yields from your SS? Wat use are some of your heroes, if you have vampires? What use are the extra policy slots from certain civ abilities, when you have owls? These extras don't add up linearly. You don't really need more yields when victory is already inevitable. Except for when you are really into winning as fast as possible, but that's not really what I go for. I prefer long fun and challenging games to speed.
Therefore I think the SS mode should get some balance tweaks, a little bit, and maybe a little bit more conditional. Don't just throw yields at me, but make me put some effort in it. Let it come with a price.
On the other hand, the mode would also be a lot more interesting with a better AI. Why does a science-focused civ go for voidsingers when they don't need tourism and they also don't use their voidsingers to get cities? I feel like I am using the SS to my advantage way more than the AI does, which makes me as a player OP and therefore the games really boring. The same is to say for the Monopoly Game Mode.
So it's either balance or AI for me, preferably balance so that it syncs better with other game mechanics.