Most of the most popular stuff in hip-hop (also contemporary R&B) is also some of the worst stuff - that's why a lot of people don't like it. Of course, there's a whole world of hip-hop out there and a hell of a lot of it is utterly fantastic, it's not as diverse as rock or electronic music but I think that is more to do with its relatively young age than anything else.
For those of you can't get into hip-hop then there are plenty of ways to do so. 1) You could look for one or two mainstream rappers that catch your attention - I generally don't like the mainstream of hip-hop but I enjoy a lot of Kanye West's stuff, and some people I know hate all hip-hop but Eminem. Some people I know also like only individual UK rappers (eg Plan B, before he stopped rapping).
If the lyrical content of mainstream bugs you then just find a rapper who raps in a different language, it'll illustrate the importance of flow, rapping style and the beats without burdening you with the actual lyrical content! I think French hip-hop is a burgeoning scene, though I've not really checked it out myself.
2) Look to the past. There's a clean but kitschy feeling about 80s hip-hop which is quite enjoyable (though completely lacking in any edge whatsoever!) and the early 90s stuff before rap really hit the mainstream is a bit more hard edged, with some of the gangland themes of the tedious 50 Cent BS that followed. The difference is that it's not self-conscious, it's less faked and it's, quite frankly, musically a lot better. Lots of people like the Wu Tang Clan, why not look there?
3) Go underground. This is what I did. Just look around for something, maybe start off with rappers that are popular in some circles but not part of the hip-hop mainstream (MF Doom, Del Tha Funkee Homosapien etc etc) and then delve deeper into obscure rappers no-one's ever heard of - quite often they're still better than most of the mainstream.
Christ, you even start with some subgenres of comedy rap, like nerdcore or chap-hop, they may be completely lacking in street cred but
There's a lot to hip-hop, it's not one of my main things, but you sure as hell can't dismiss it all - it's not one of my "main things" (at least yet) but it's clear that there's a hell of a lot there. In a genre as large as hip-hop there WILL be something you like in it. No genre is bad, even if you generally don't like it, there will be something there that will catch your interest if you look long enough.