I strongly disagree. I do not think Ren & Stimpy aged well at all. As a kid I loved it, but I rewatched it when the "unedited" DVDs came out and I did not like them much, if at all.
I remember my parents, and many other parents, being disgusted by the show. I get why they would be, but ~10-year-old me didn't think it was that bad. But now I do.
At the time they were reaching for the gross factor as strongly as possible, and it worked back then because it was new, but I think it doesn't hold well anymore.
Rocko's Modern Life is a show that I think did the gross factor, albeit mildly, well, and that show, to me, holds well today.