If you think your product has potential even with your misgivings about the site design, go ahead and launch. Release early and often, as they say.

As long as your design isn't dead-awful, such that it makes users feel your product is untrustworthy or poor, release now and iterate. You might want to consider getting feedback, either from posting it here as an Ask HN post, or by asking your friends/family/strangers. See what they think, then make an informed decision.

The perfect is the enemy of good. So is the bad.