EGA was what PC gamers had to contend with before 256+ color VGA and SVGA modes were standardized. EGA supported 16 simultaneous colors from a pitifully small palette size (I think significantly smaller than NES), thus EGA graphics generally suffer from this uniform and really garish look.
I think LucasArts eventually got really proficient at working within those color limitations in their SCUMM games. 2 screenshots from Monkey Island and Loom respectively running in EGA
Sierra also seemed to get pretty comfortable with achieving their artistic vision in their games, however they still went full on blasting you with all colors of the spectrum while LucasArts aimed for a more muted and focused look in their environments.