Lampard really isn't a bad manager.
Aside from finishing 4th when the majority didn't predict us to do so, some of the football and performances we played under him were astounding. We've gotten results against Liverpool, United, City, Spurs, etc playing some great football and the best thing about it was Lampard introducing and trusting our youth players, along with improving several others. He has blatant weaknesses regarding how he approaches games and his tactical set up, but the potential is there. That's the key thing. People want to talk about the state he left us in, but better managers than Lampard were not able to cope with the pressure of being a manager here. Conte, Mourinho, Sarri, Ancelotti, have shown they didn't have the slightest fucking idea what to do when the pressure mounted up.
As I mentioned previously, Everton need someone who can win the fans/players immediately and instill his ideas quickly. I think Lampard is someone Everton can build to trust, starting with avoiding relegation.