Each group/person/run is different. If you are not comfortable with a speed run, say so, you will be surprised how courteous the majority of people can be. That said you can't expect everyone to abide by your definition of "fun." For some speed running is "fun" I, for example enjoy the spice of a speed run. Throws a bit of challenge in (dungeons are otherwise pretty boring after the first few "new box smell" runs cause you do them everyday)