well think of it this way, knight and squire don't live in gotham, they don't fight anywhere near the ammount of psychotic superheroes on a regular basis, it makes sense they would  be far from dark and gritty. And obviously  if you dislike Robin then you will squire as well. 
 
And DC is hardly all grim and gritty, they haave momments but thats usually with batman, and is contrasted  by robin. Keep in mind Knight is cyrus, a boy who was very much like  Dick Ggrayson was. And he took over, so that explains the personaality, being less dark.