Hey there, Feaxy and welcome! They're pretty amazing as a monotype team, I'd have to agree! There's just so much diversity, type possibilities and stats amongst them. And I'm not surprised that you'd find them deadly and fearsome, haha. Those are definitely the first two words that I thought of when trying to describe them.
I know I've already gone into Houndoom before but to answer the POTW discussion:
As stated before, Houndoom was formerly my favourite pokemon. Today, it's my second favourite. There are many reasons for this, the first being that it was arguably my best MVP of all time. Another reason was that I absolutely loved dogs, which Houndoom was. And then there was the unpleasant dex entry which really got me hooked into wanting to use and learn more about the pokemon.
When I was a kid, I loved dark or beastly creatures. Werewolves, dragons, basilisks, you named it. Seeing Houndoom was like combining two of my favourite animals and ideas together; darkness and canines. Combined, the two created what could be mistaken for something along the lines of Death's pet dog. As for the whole never ending pain and howl of the grim reaper that comes with its dex entry, it's a bit unsettling but rather cool in a way. They'd probably create fear and terror amongst the pokemon universe but like dogs, would be loyal to the ones they cared about the most. Pretty sweet, really.
I won't go into anything else since I've covered it before but yes, I like its mega too! I think they did a great job at making it more intimidating. :]