This story is short and entertaining. I can't claim I really understood the point of it, the ending felt extremely rushed and lackluster (which I think could have been mitigated if this was a four-parter and they had more time to, well, have a plot), and the Master's plan doesn't really make sense within the rest of his characterisations, but there are sword fights and horses and iron maidens, and it's just plain mindless fun. It's certainly not as boring as most other Fifth Doctor stories I've seen have been.