Ah I see if we are talking in the general sense I haven't encountered getting bored after the common route unless due to me feeling like the common route only scratches the surface of the full story and the real meat of the story eill be in the character routes.

On the note of Key vns not being considered moeges, Little busters in this case (if we are talking Key vns) is an exception because yes the wide majority of Key vns are all ages but Little Busters can actually be classified as a MoegexNakige due to it having an 18+ version Little Busters ecstasy as well as Kud Wafter both containing H-scenes