I honestly don’t hate Quantum. It’s not amazing, but I’ve never really understood the unmitigated hate for it. It suffered a lot from the writer’s strike though. And it works best if you see it as an epilogue to CR than as its own film (though that isn’t exactly praise for the film). The opera scene is fucking great though and I’ll fight anyone who says otherwise.
The opera scene is okay, but (like a lot of the movie) is kinda ruined by the editing. Mission: Impossible - Rogue Nation did it better anyway.
SPECTRE, on the other hand, was offensively boring and a waste of a great actor (Waltz) on what should have been a great character (Blofeld). I’m actually hoping he comes back for the next one so he might get a chance to redeem the character.
Spectre I thought was massively underrated. The final third legitimately sucks but the rest is really pretty good. Much better than Quantum (one of the bottom five Bonds for me).