The uncut version was shown by mistake on Bravo a few years ago, I don't know if they got a telling off for it though.
I'm not against explicit rape scenes, I'm against explicit rapes that use them as a set up to justify extreme violence and then fail to deliver it.
In I Spit on Your Grave, the rape scene goes on for half an hour, and the revenge goes on for about 20 minutes, none of it is shown particularly explicitly so you're left with a film that is about an explicit rape and then a couple of scenes of revenge tacked on the end as an afterthought to validate its extremes. It uses the rape to manipulate the audience's emotions to cheer on the heroine, then fails to deliver a satisfying conclusion. Basically, it's not violent enough.
Deathwish 2 is so bad because Deathwish 1 was so good. It's devoid of anything approaching artistic merit, it's technically inept, the acting is terrible, and the characterisation/plot/dialogue is so laughably shite, it could almost be a spoof of the original, but lacks the wit to send itself up.