Generally positive first impressions, despite the new stadium looking a bit like it's been based on a Lego model. It's quite different from any other similar sized new-build soccer or RL ground that I've ever been to, and the views from the main stand are pretty good, even at the back. And even if the rugby on the playing field proves not to be up to scratch, you can always watch the traffic thundering by (or crawling by, as the case may be) on the high level bridge.
Not sure that the car parks at the stadium are big enough at present though (there's still quite a lot of undeveloped scrub-land around the stadium that could potentially be used), or where folk refused entry because they haven't booked in advance will end up. (Overspill at Barton Airport perhaps?)