No amount of hard work and usefulness can amount to a beautiful product.
I have strong feelings about Lean Startup who told me to create a MVP, which made me look like an amateur.
So, listen to the marketing people and wait to release a beautiful finished product.
If you're in a domain where aesthetics and "beauty" matter, then your MVP is missing the "V" unless you have, indeed, made the thing beautiful. The Lean Startup approach doesn't tell you not to make things beautiful... it just tells you to make only what you need to validate your hypothesis. If that means making something beautiful, then you make it beautiful.
There are lots of fans currently, but at the time(and to this date), I get people questioning legitimacy due to a having a white shadow in my CSS.
Seen way too may times where stuff was rewritten to look better but usability suffered.
Case in point: Walmart recently redid their self checkouts. The new system looks a lot better and I like it if it did not take 3 times as long to pay. It even took forever compared to the old one to register cash being inserted. And there were several complete lockups.
Recently it seems better so I believe they have been working on the back end but for a while I would not even touch them