Doctor is annoying, but far from overpowered

A lot of people say doctor's base kit is too loaded. But that isn't true, his ability is one that can be used as active slowdown ( meaning he himself has to apply it ). Some tracking if you're attentive, and in chase if you have good timing. But that comes with a distinct lack of mobility, the doctor still has to walk across the map like everybody else. As well as the fact that the doctor depends on his addons to add more weight to madness.

If you want an example of someone with a loaded base kit. Look at freddy, who has map mobility, traps that can be placed without a speed penalty, and passive slowdown. Freddy's slowdown is much better because it forces survivors to go to the other side of the map. Another thing worth mentioning, freddy doesn't have to apply his slowdown, it just happens no matter what.

The two are surprisingly similar if you take away freddy's mobility. But doctor is the most fair of the two.