If you want to see very good hi-res graphics, you should try Broken Sword 2.5 and Zak 2: Beyond Space and Time, although both are not AGS games and rather suck at being adventurous (Zak2 being slightly better than BS2.5).
As for AGS, I think many people here like the pixellated style, but you should nonetheless give some games a try. They're great!
As for AGS, I think many people here like the pixellated style, but you should nonetheless give some games a try. They're great!