I think when the 25th anniversary dvd first came out most of the people I knew who had seen it were aflutter with this cast being the 'best" cast, but I don't think they ever completely sold me. Having grown up listening to Sarah Brightman, Sierra's soprano just didn't seem as operatic enough to me, especially on songs like All I Ask of You where it seems like a solid musical theater soprano. I just assumed I didn't like her voice, but I actually fell in love with it on the Little Mermaid OBCR so I think she was just slightly miscast in Phantom as far as I'm concerned, and I don't think any of the other Christines I've heard since then, either online or live, have had that same musical theater-ness to their voice.
Ramin I actually did enjoy, but I commented to a friend that he seemed to be outsinging the role of Phantom, as ridiculous as it sounds, though I what I felt is probably what earlier commenters mentioned about him pushing notes sharp and just feeling like he's pushing himself harder than necessary (though his first vocal entrance in the dressing room I thought was thrilling).
I didn't know much of Laurence Connor before this, outside of just registering that he had also done the JCS arena tour (which I thought was fantastic), but one of my friends also mentioned to me after seeing this version that "Christine and Phantom were definitely horny for each other the whole time". She thought didn't make the story as compelling as if Phantom were more of a sympathetic villain, which seemed to align more with a recent Broadway production that she had seen. It's been a while since I saw the show on Broadway, so this version definitely sticks out more in my mind, but I'm assuming that what's been on Broadway is probably close to Hal Prince's original vision? I heard he used to make pretty frequent visits and would give notes or help tighten things up.