My main feedback is the continued lack of a "latest update" option in the "sort by" drop-down. That's the only metric I ever use, to find games that have updated since I last checked. Without that it's inferior to the current search box.
You must be registered to see attachments
The new version seems to have lacked this sorting option for quite a long time.
Admittedly the current search/filter doesn't have the very useful exclude and prefix features (though an "exclude prefix" would be a nice addition, i.e. filter out RPGM or HTML, perhaps you could allow for standard search operators like -RPGM or something), but at least the current version does let me sort by updates.
Edit: For a second I thought I was being stupid as you can put HTML or RPGM into the exclude tags box, but it doesn't actually filter them. Maybe the simplest option is for the Exclude Tags box to include all prefixes and statuses as well, that way you can filter the list exactly how you want it.
Also, there's a scrolling issue, I have to scroll to the entire bottom of the page just to get at the filter button on the search sidebar. My second screen is running at 1600x900 which is why it won't fit unless I scroll down for ages, which isn't ideal, anyone running an old laptop at 1366x768 would have it even worse.
Apologies if anyone has stated these already but I'll add them here anyway.