Love this pony a lot! She might seem boring if you look at the G1 range as a whole, but I think to appreciate her you need to look at it from the perspective of the time she came out in. In 1983 she and her set mates were completely unique and set the standard for all MLPs that followed. I think that's very cool!
I think of her as the "original pony" even though she wasn't first. She's iconic!
Since CC is the only one of the original six to retain the spotted symbol that originally all of them were intended to have, I think of her as the ur-pony. At least she's the one that's closest to the original concept.