I can think of a few poorly-received films that I liked, but I'll go with Freddy's Dead: The Final Nightmare.
The 1/10 rating I saw it get last time I checked ImDB suggests to me that this one wasn't too well-received, but this is my third favourite in the series - after 1 and 3. My reasons:
*A more tongue-in-cheek script than any other film in the series; stops it getting too heavy;
*The first film since Dream Warriors that felt like it was taking an original angle;
*That whole video game sequence - I loved it and
*Good flashbacks with a makeup free Robert Englund; forget that overdone "Freddy's Birth" scene from The Dream Child.
So, yes, this is a guilty pleasure film for me - I'd definitely rewatch it, and have all the first six films on DVD.