"I've never seen an RPC system that I really liked."
I must admit I've never seen a message passing system that I really liked either :-) Mind you that's possibly because of times making stuff work in environments where someone made the decision "you shall use message passing for all inter-system communication" even when it wasn't always the best option.
These days my practical test for a remote API is whether I can stand using it through cURL - if I can happily do stuff from the command line then the chances are that code to do stuff won't be too insane.
I liked QnX, currently playing around with Erlang. (Erlang has tons of warts but it gets enough of the moving parts just right that I find it interesting).
I must admit I've never seen a message passing system that I really liked either :-) Mind you that's possibly because of times making stuff work in environments where someone made the decision "you shall use message passing for all inter-system communication" even when it wasn't always the best option.
These days my practical test for a remote API is whether I can stand using it through cURL - if I can happily do stuff from the command line then the chances are that code to do stuff won't be too insane.