Early Doctor Who has very odd pacing. The acting is done well enough, but it is not nearly as refined as any show on television today. Modern viewers will no doubt need to apply themselves to maintain focus. Even though this series is the last Hartnell series, he isn't written as a main role in the scripts. There are a few plot holes in this series, and as I mentioned before the pacing is something to get used to.
I enjoy being able to let go of my internal demand for flawless effects and realism whenever I watch Doctor Who. That being said, the costumes, props and effects are very primitive in this series.