I listened to a LOT of Hip-Hop between 1987-1992 which is considered the "golden era" of that scene. This was before most major labels figured out the formula and saturated the music market with all the fake commercial gangster rap that still makes more money than anything else to this day.
Back then it wasn't about misogyny and violence. There were many artists out there who were very innovative - The Beastie Boys were the best of the bunch. You had artist's like Public Enemy, The Jungle Brothers, Gang Starr, Paris, The Pharcyde, Boogie Down Productions. You also had artist's like Ice-T who was like a Hip-Hop version of pulp writer Iceberg Slim [it's also how he chose his name]. His lyrics and stories were hilarious. He's collaborated with Jello Biafra, Slayer and Perry Farrell. If you ever get the chance, check him and Jello Biafra out on The Oprah Winfrey Show. There were some other great lyricists like Big Daddy Kane [who did a great track with Rudy Ray Moore], Guru and Rakim.
All of these artists were experimenting and forming something that was completely new and fresh at the time. Hip-Hop was considered the "Punk Music" of the 1980's due to it's DIY ethic. You have to remember how bad the music scene was in the 1980's...
So I can honestly say Hip-Hop has had a very positive influence on me, personally. It opened my eyes and ears because of it's use of sampling other music and i'd also say that in a weird way it's influenced me as a podcaster. Hip-Hop artists would sample James Brown and AC/DC... and sometimes in the same song. It showed me how you can mix things up, come up with something and make it work. Heck, I even snuck in a Prince Paul [producer of De La Soul and DJ from Stetsasonic] track on one of my shows and I doubt anyone even noticed.
I think the problem is that most people who criticise Hip-Hop probably never got to listen to the real hardcore underground stuff. They're really talking about the stuff that dominates the charts. Eminem, Dr. Dre, etc. It's like someone slagging off Garage because they've heard The Hives and Jet.
By the way, I went to a Bad Brains gig once and their support act was a Hip-Hop group called The Goats. Grandmaster Flash & The Furious Five supported The Clash. PWEI supported Public Enemy when I saw them. I guess everything's linked when you think about it.
Oh, and check out The Beastie Boys "Paul's Boutique" album, produced by The Dust Brothers who did the Fight Club Soundtrack.