The world is only as interesting as your algorithm. 5 billion unique planets doesn't mean 5 billion unique ways the planet can look or behave.
I'm frequently frustrated when people are ignorant of the limitations or procedural systems. You'll see repeat creatures, repeat aliens, repeat spaceships, repeat resources, repeated flora, etc... you just won't see the same mix of colors and animals on a different planet.
But a blue florp under a purple sky isn't that different from a cyan florp under a azure sky. Seing a green florp eat purple leaves is not a unique experience from seeing a yellow florp eat blue grass.
I'm sure we'll see a lot of great screenshots, and like Minecraft I'm sure there will be the occasionally enexpected terrain generation that will rightfully take our breath away. But... I expect thousands to be let down when every planet is not a unique work of art.
Every snowflake is unique. That doesn't mean you won't bore people with an art gallery filled with snowflakes.
And yes, I'm ranting at nobody. Get off my lawn.
Dreaming Demon, formerly Tikatt, formerly The Raven