I actually think Cannibal Holocaust is a decent enough film (though the cut version is the only one I'll watch), but have no time for I Spit or Last House, despite the latter being held up as a classic by some.
I do adore The Evil Dead and Zombie Flesh-eaters, though.
Many of these films are pretty tame now compared to American 'torture porn' and the stuff coming out of France.
I was having a random clear out of stuff I'd taped off the box at the weekend. Worst of the bunch was Shrooms (like a bad Talk to Frank ad dragged out to 90 mins). Hannibal Rising (though it destroyed any of the mystery of the Lecter character), Ils and Brides of Dracula (proper old skool Hammer horror) were all okay. Biggest surprise was Blade 3 - had avoided it coz I thought it was meant to be crap, but it was as enjoyable and funnier than the other Blades.
*end of ramble*