I think the reality is David Moyes means different things to different fans.
If you're like me and had the fortune to start supporting Everton at the end of the 80s, then all you saw was around 15 years of perpetual relegation battles and long-ball shite, albeit with an amazing FA Cup win in the middle of that.
We were fucking shite till David Moyes came along and turned us into a quality, respected side. One you could be really proud of. We may not have any silverware to show for it, but the Moyes era was one I'll always look on fondly for how it transformed the club and the foundations he laid for the future.
For older fans who saw the success of the 80s, or conversely younger fans who didn't see the misery of the 90s, I can certainly understand a different attitude towards the man.