It became so popular to trash QoS that the press was almost destined to love the next one, especially if it addressed the supposed sins that kept QoS from being a masterpiece in their eyes.
That and the fact that it had some true "artists" working on the film, the kind that the academy could wrap their arms around and embrace because they'd already done so several times over in the past.
Yes, it was built up before it even opened by the fact Mendes was directing.
SF was a little different and showed what could be done with a Bond film. It was exciting in those terms. It was also the 50th anniversary. IIRC the competition was relatively low at the time of release, which always helps. A film's success is often due to timing.
There was also a four year gap since QoS so there was time to fully embrace Bond again.
SF is good, interesting, well made and different. I prefer the previous two films, but think it is better than Spectre.