I have to agree that Archeoptyrx is just one of those "strange" animals, whether bird, reptile or mammal, of which I don't think really matters. There are many many strange types of animals that don't "fit" into a generic category, and furthermore have absolutely no intermediate fossils linking it to other more "common" types of animals.
Evolution is NOT science. It only uses science in a crafty attempt to explain away or to give an excuse that something didn't happen, namely, Intelligent Design.