I can't find any real info on asian paper wasp stings, but I suppose some wasp stings can be very serious. I think it only took 10-20 stings from some japanese hornets to kill an adult. But that's also because they inject much more venom than ordinary wasps

edit: found some info on paper wasps. Apparently a sting from one of those is level 3 of 4 on the schmidt sting pain index. Higher is more painful. Normal yellowjacket is level 2