I say it's a little bit both, as well. It one sense, it certainly isn't everybody's cup of tea. And in another, it isn't perfect. But then again, every great musical is flawed, no? Well, okay, ALMOST every great musical.
I had a really great conversation with someone I worked with this summer; someone who's quite an expert in musical theatre history. Anyway, he says he hates Rent because of its imperfections, and because it's over-hyped. But, deep-down, he does love it. He saw the original cast, and the show impacted him in ways that it impacts a lot of its fans. He also said he loved it for what it's done for so many people; even with technical imperfections, it's hard not to overlook some of them when you're talking about a show that has changed so many lives, etc. He did say that he thought had Jonathan not passed away when he did, the Broadway transition would not have been so fast, but rather more (necessary) work would've been done on the show.
I think that put a lot of light on how I see the show, in addition to things that continue to come to light as I learn more and more, often from people on this board.
The "revolutionary" aspect of it is pretty obvious, I guess. So, yeah, a bit of both.
A work of art is an invitation to love.