As for Lampard, it's a strange one to judge. I thought out of Ole and Frank, the latter was displaying traits of a potentially top manager early on in the season. Tactically and systematically, the football appeared to be more progressive and advanced than what we were under Ole. With the signing of Bruno and return of Pogba, we've completely transformed and that's either given Ole's team a bump/purple patch or truly allowed his ideas and management to shine through depending on your perspective. However, Chelsea, as the season has grown older, haven't really built on their early promise. If anything their defensive peformances show no improvement and possibly have even regressed and their season appears to be meandering rather than progressing.
Having said the above, Ole has had, what is it, nearly 200 million to spend of new signings and Lampard has had a transfer ban. So, while I think Chelsea are a football club that should demand excellence and if they feel Lampard appears evidently to be average or decent that shouldn't cut it, like it shouldn't for us. But there's an argument to be made that every manager deserves at least one /half a season having had a window to sign some players.