Bear - I'd be intersted to know what your grade for the old NBL site would be? For mine, it's too early to tell if the current site is a material upgrade or not.
I assume you accessed the stats and historical game scores via the 'Stats' link. That just links to the Fox Sports Pulse web site, which was what the previous site did. So no change in content there, only to the entry process. That is certainly easier - entry link is easier to locate and fewer clicks to get there. But that wouldn't cause me to upgrade its score relative to the old site.
The 'Schedule' link doesn't give you a view of the NBL full season schedule that fits a single screen or can be downloaded and printed. There is a PDF on the site but it's not accessible from the Schedule page. It's at the end of the news article announcing the release of the schedule. While the calendar downloads are an upgrade on the old site, the lack of a full schedule view is a downgrade for mine. The full page view on the old site also showed scores for all games to date, which was a quick way to go back and check specific scores. It's not clear to me how that will be done with the new site. So, schedule page overall is less functional for how I like to use that info while being a significant upgrade for a lot of other folk. Call it an upgrade overall.
Like Isaac, I prefer clean, simple designs that make it easy to find and access information. Cluttered designs and other bells and whistles just aggravate me. The new site tends towards the latter. That said, it's a modest improvement over the previous site in that regard. In other respects, they've not got it working right. e.g., the news/twitter bar in 'Social' scrolls too quickly; 'TEAMS STATS SCHEDULE TICKETS' headings are only half visible at the top of the page for some zoom settings (happens in Firefox and in Edge browsers). Little things like that are lethal to the user experience and are things I expect will be tuned over the next few weeks.
For me, the 'killer change' is access to live scores. About 3 seasons back, the NBL site had live scores shown for each round's games, on its front page. Clicking on a specific game's score would take you to the live scores page for that game. Very similar to the AFL site (Match Centre feature). That disappeared with the site revision that happened around the time Marc Howard left (~December 2012?).
Like most people (I think), the reason I follow NBL is the games. Being unable to access the live scores quickly, easily and reliably was the biggest failing of the NBL site over the past couple of years. If the new site hasn't fixed that, then I'd grade the revision as failing in that key area.
I'll wait to see if that's the case. Hopefully, we should be able to see if that feature is available for the pre season games.