I have a 5, and to be honest I think I like the 5C more.
Something about it just feels fresh and nice. I really want a Blue 5C but i'm not wasting a 2 year upgrade on one.
Oh well.
Same here. The blue 5c seems to be everywhere I look, but it'll be another year before I can even think of purchasing one - and by then Apple is expected to drop their plastic models TT___TT
Answering OP's question, I would say it's just Apple's approach reflected over the plastic surface. Industry in general recur to plastic when they want to lower prices - and that's the case with Apple too. However, Apple cares so much more about small details than the competition that anything 'feels' better, and we can see this extra work reflected in the 5c's casing. It looks much too awesome to be plastic, especially when compared with other plastic phones.
Too bad Apple will discontinue this lineup... I was really looking forward to see a TouchID on a blue iPhone