Unity was first released in Ubuntu 10.10 Netbook Edition. And that was based on Ubuntu Netbook Remix, first released in 8.04 (they didn't necessarily share code, but the design was similar).

You would think that by 11.10, released a month ago, they would have something release-quality. I think it's just the design that people don't like. Canonical has the resources to fix bugs, but they don't necessarily have the desire to fix design defects.