Honestly better than I remember on a rewatch. Yes, the pacing is a bit iffy at places, the writing can be a bit samey at points, certain performances are very hammy and they still haven't nailed the character of The Doctor, but the first episode is fantastic and there are quite a few bits of neat writing throughout the cavemen story like The Doctor talking about hope and fear with Barbara. So, some good, some bad, some great, so at the end, it evens out to a solidly written story for the time, and still quite enjoyable today, not the most sci-fi way to start a sci-fi show, but it's well done all the same.
7/10