Last I checked the there were enough free parameters in these calculations to make the calculations of less than convincing. For example those 'hadronic observables' make up such a big part of the actual results that what is left over is within the error bounds anyway.

However, that was over 7 years ago, and someone else in the comments linked an article talking about the breakthroughs since then, and they seem significant, so things may well have improved since then.

Regardless, lattice QCD has always been real science and always been quite impressive. Any direct attempt to match theory with known experiments always is real science regardless of whether you agree with the methods.