I had this dish a few years ago and from what I remember it was quite good (not fabulous but then I prefer more of a cream sauce with a seafood pasta). I am also a big fan of spicy food but this was not as spicy as I would have liked.
I agree that it wasn't as spicy as I was hoping. I like things with a kick, and remember commenting that it was more like a spaghetti sauce than a diablo sauce.