Yes, I'm giving "The Horns Of Nimon" a perfect 5-star rating, and no, I have no shame about it. I'm giving this much-maligned "Who" story the highest rating for the simple reason that I totally love it, despite the majority of fans saying that it's too silly (no no no, people---"The Creature From The Pit", THAT'S a silly story. I mean, an inflatable bean-bag chair with arms for a monster? And that's just for starters....). I guess this puts "The Horns Of Nimon" in the category of "guilty pleasure" for me. Fine, it's a guilty pleasure of mine. And I'll tell you why:
As another reviewer pointed out, one of the main things I love about "Horns" is that it is, in my opinion, great, GREAT fun. It's funny, lighthearted, doesn't take itself too seriously, and, as fate would have it, it's the very last story in which you'll see Tom Baker as the REAL fourth Doctor (not counting the never-completed "Shada"), before producer John Nathan-Turner swept in and shamelessly destroyed Tom Baker's Doctor by not only changing his costume (I never liked the solid-red costume, OR those stupid question marks on the Doctor's collar), but also changing the fourth Doctor's *personality*, making him a lot less humorous and a lot more serious, to the point of being a shameless grouch (and by the time Tom Baker's Doctor finally snuffed it at the end of "Logopolis," I was GLAD to see him go, considering what JNT had done to him---mind you, it's not Tom Baker's fault, let me make that clear). In "The Horns Of Nimon," Tom's Doctor is still his old, jolly self. Baker is clearly having fun in this story, and it shows in his delightful performance here.
I'm also glad that other reviewers have mentioned that yes, indeed, "Horns" is easily Lalla Ward's finest hour as Romana. She was fine in her previous stories (and she's always very easy on the eyes too, of course), but, finding her footing in the role at last, Lalla's Romana is truly the Doctor's equal in this story: brave, strong and assertive but never overly-so. Although Romana still needs rescuing at one point in the story, she's never, ever reduced to being a damsel in distress here, like she was in "Destiny Of The Daleks" or "The Creature From The Pit". Lalla Ward's performance in "Horns" is an excellent one, and her best one.
As for the cheap-looking sets, visual effects, and the cheap-looking Nimon itself, they're all fun too. Look, I'm not going to argue with any fan who hates "The Horns Of Nimon," as I know perfectly well that it's not, and never has been, a popular Who story (ditto for "Underworld," which I also happen to like). But I'm sticking to my guns about "Horns" nonetheless that it's one of my very-favorite Tom Baker stories, and I'm very pleased to see it coming out on DVD quicker than I thought it would (it was one of the very last Baker stories to get released on VHS). Like another reviewer already said, "The Horns Of Nimon" also represents the end of an era for Doctor Who, as you would never see another Who story quite like it ever again (which has both positive AND negative aspects to it, I suppose). "The Horns Of Nimon" may not be a popular Doctor Who story, but I love it. Bite me.