Difficult to generalise but I think on average our players tend to be slightly overrated by our own fans and also the wider media. Exceptions either way - Modric and Dembele come to mind immediately.
I'm not so sure we overrate. We do have a squad that has achieved multiple top four finishes, reached a major final and certain players we apparently overrated, players like Walker and Eriksen who many of my pals said I saw through Tottenham tinted glasses went onto play for major clubs earning major deals for themselves out of it.
A pal of mine said I was bias when I suggested Lloris was a far better goalkeeper than the likes of Kasper Schmeichel. The numbers speak for themselves. Each person is different I guess but I think as a fanbase we kinda know the decent ones from the ones who ain't gonna cut it in N17.