Lack of pace in qualifying, lack of reliability, lack of outright speed in numerous races, only really excellent at one type of track.
There's more to Mercedes winning the titles races before the end of the season than Vettel's idiocy in Baku.
Unfortunatly the end of the season revealed that all the competitiveness of the SF70H was not more than the error that was the 2017 project of Mercedes. But they has a so big advantage that didn´t loose any WC and at Abu Dhabi restored the gap they have since 2015.