I've never considered myself a "medium" but I've done a lot of readings for people on their dead relatives, & they've all been pretty strong readings so, who knows.
I always tell people, though, that it's iffy at best whether these readings are actually from the dead or if they're tapping into the beliefs of the questioner.
For example, the first time I ever read for the dead was for a friend of mine who wanted me to do a reading on her dead mother. The cards came up just really violent & hateful & vindictive & cruel. I told her it was kind of confusing me what I was seeing, & she insisted I just tell her straight up. She said it was right on target, as it turned out, her mother in life had been a terrible alcoholic schizophrenic child beater who used to beat her across the face with belt buckles. She took the reading to mean that she had NOT found peace in death & that she carried her chaotic nature beyond the grave. I told her, it could also be that this was how she remembered her.
What's interesting to me is that even though I've read for people with drastically different belief systems than my own, the readings invariably reflect the questioner or dead person's beliefs, not mine.