This was the very 1st DW story I ever saw (not counting the 2 movies), though of course, the 1st time I saw it, it was in color. My videotape from PBS (in the 80's) is in B&W. (Stupid BBC Archive Department!) The entire section which introduces "Bessie" and shows The Doctor & Liz Shaw traveling was missing from the syndicated version. (Stupid commercial breaks!) I've seen GENESIS OF THE DALEKS so many times (too many to be honest) that it's kind of a relief to see Peter Miles playing someone who's merely hard-nosed, not outright EVIL. Fulton McKay, who I've also seen in various episodes of THE AVENGERS and THE SAINT, seems to be just too cheerful, and sure enough, he's hiding something. Norman Jones as the security chief is a bit hard-nosed himself, but lightens up noticeably around Liz. Jones would return memorably to play Hieronymous in THE MASQUE OF MANDRAGORA. Liz got a lot more attractive this time-- her hair's in bangs (instead of pulled back tightly) and she's walking around in a miniskirt. Somewhere I read the observation that she was a "new" type of companion for the show, but I see her as a slightly younger, and much prettier version of Barbara. With that thought in mind, and considering how Pertwee apparently confounded all expectations by playing The Doctor "serious" (when he was known for and cast for his comedy talents), he seems almost-- vaguely-- like a younger version of William Hartnell.
The dinosaur's not as embarrassing as one might expect (perhaps it's the B&W that helps) though it does seem on a par with the ones in THE LAND THAT TIME FORGOT. (As the 1940 film ONE MILLION B.C. proved, that kind of thing can work, if you keep its appearances to an absolute minimum, and mostly in the shadows.)
I keep wishing this were only a 4-parter... or at least, a 6-parter. I wonder what possessed producer Barry Letts to have 3 7-parters IN A ROW???