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Rocketry is one of the single hardest things to do right. Their goal is to always go a bit further than last time as, by inches, you approach the goal. And this one went wayyyyy further than the last one. That alone makes it a huge success. Obviously not as big a success as going all the way in one go would have been, but nobody was really expecting that (even if we might secretly have been crossing our fingers anyhow).
You should've seen the build-up to creating self landing rockets. It was like a fireworks shows every launch, until one day they nailed it - and now it's become near to mundane. The same thing is happening today, except with something even more revolutionary.