Welcome to the forum!
Being honest, it isn't the best by any means, but it isn't the worst we've ever seen. Mine is less than perfect, so I sympathize with you, and understand the disappointment. You don't have many options unless you still owe the builder a lot unfortunately. If so, he might agree to re-do it, but it would be excpetionally unusual if he did. Perhaps you can negotiate down on the final installment to a point that would make things more satisfactory for you. It's likely just cosmetic, so not the worst thing, but I know it stings. Sorry you're coming here for this, but I hope you'll stick around and enjoy our forum.