While I don't want to take anything away from memcached, I'm puzzled by the swipe at Redis. Whatever marketing you're referring to, Redis supports some pretty useful data structures that make some pretty common query patterns trivial (eg top-N queries) and does it with a small, elegant core of some of the most readable code ever produced.
Memcache OTOH is a fairly simple KV cache. It seems to be pretty decent. Neither of these supplants the other however. Hence my puzzlement. It just seems out of place, unnecessary and doesn't really add anything.