I've noted a lot of quirks with the review writing system. Some feel like bad design choices, others just feel like bugs.
For one, my profile page says I've written 7 posts, but if I click it, only three are shown here: http://brickset.com/reviews/PostedBy/?User=henrysunset
For another, I find it frustrating that *I* cannot see my pending reviews which are in progress. This doesn't give me confident that my review was actually stored to the database at all.
Likewise, I find it weird that the site doesn't make it easy to see my ratings as part of my collection. Sites like BoardGameGeek.com or BeerAdvocate.com let you see a gallery of your "collection" and sort based on ratings, etc.. (be it a collection of Board games, or beers you've tasted)
Lastly, I don't understand why there is such a high bar to write a review. Perhaps the site would get much more review data if it makes it easy for everyone to rate all their sets quickly, and record a quick private comment about the set. Some users would still be willing to take the next step and write a formal public review, which includes the other dimensions of rating such as value, building experience, etc... Naturally, more weight could be applied to these more thoughtful public reviews if you want.
I *want* to make an effort to review ever decent-sized set which I build, but the barrier for entry and the demoralizing delay in seeing my review is a big disincentive. Likewise, you have an opportunity to go one step further and integrate the reviewing experience with social media services like Facebook.
P.S. I respect the hell out of the awesome work on the new site, so please feel free to let me know that this feedback will be considered more seriously after the new site goes live.