[flashgordon]

+1 Couple of things I really hate about proto - No generics/templates. No composition of services or mixins (you do have composition in messages but that feels very limited). Also the clunkiness around having to declare more things (try a repeated map field or a map of repeated fields).

My comment about protos was just the spec (and was seperating the binary formats as a different concern). But your concerns are pretty valid.