How does the saying go? "If you gave out free $100 bills to anyone who wanted, someone would still complain about the way they were folded"?
Ringworld-sized balancing problems aside, umm... can I point out that we're ACTUALLY getting buildable ringworlds of our own? Complete with fleshed out step by step construction mechanics? Complete with shipset-based graphics to put our civilisation's unique spin on it? In what insane galaxy is that "underwhelming"?
Not only is it just whleming enough, I'd buy Utopia just for that, if it wasn't coming with EVEN more amazing features we've been dreaming of since the game came out!
BACK IN MY DAY we had to build ringworlds with our bare hands, knees deep in vacuum, against the pull of gravity, BOTH WAYS and we LIKED IT!