I can certainly appreciate the expense and the detail of the ambitious television story The Web Planet, but I have found it to be one of the most difficult-to-watch Doctor Who stories. In fact, I never watched the DVD all the way through-the only Doctor Who story where I have done that-and struggled with VHS all those years ago.
However the "sequel" is marvellous. Whether this is because there are no challenging "visuals" to detract the listener or knowing of the Doctor's previous adventure is difficult to say, but this is a solid, enjoyable Big Finish story and is far better than the title might suggest.
Also, knowing this is a story about giant insects, then probably a listener could enjoy this without knowing about The Web Planet, although it helps as there are some nice touches.