This sort of topic has probably been done before, but I can't find anything using the search feature. Moderators are obviously free to lock this if this topic is a duplicate.
My first exposure to chiptune happened via keygens. I didn't think much of the music until I heard popular music utilize chip sounds (I had a bad taste in music back then) and that made me curious about the actual music those popular artists were "ripping off". Arpeggios were my favorite sound back then and they still are. Nothing says electronic music more to me than chiptune arpeggios. Shortly after I started developing a strong liking for all types of chip sounds. The retro aspect of the sounds, the rawness and simplicity still draw me to this genre to this day and it still remains my favorite. It's really mostly about sounds for me, and not just for this genre, but for music in general.
Of course, there are other nice aspects, such as the fact that a lot of chip music is free (old video game soundtracks, demoscene music, etc).
What do you guys like about chip music in particular?