The stuff about Lampard is all simply because he's not as good as Tuchel. It's an irrational argument because no one close to the calibre of Tuchel is coming here.
Judge him in his own right and on his achievement during the season of actual real football and not the season of fake behind doors football where his new signings took 6 months to find their feet. The centre forward he was given was immediately replaced by Tuchel with a 90m pound forward as well.
He got top 4 in a normal season with a young team, during a transfer ban, after Hazard was sold. That was an excellent achievement, and the fact that he couldn't get Werner, Havertz, Ziyech etc to perform immediately doesn't concern me at all, because Tuchel finds it hard to get consistency from them too.