I’ve never seen The 6th Day, but the title wasn’t familiar to me. Looking up the plot, I do have memory of someone telling me about it a few years after it came out. It looks like it got a lukeward reception and was nominated for some Razzie awards.

https://en.wikipedia.org/wiki/The_6th_Day#Box_office

I’d be open to watching it, but it’s only streaming on pay-per rental.

You don’t miss anything with T3.