Well luckily I DO listen to a little bit of everything.
I don't find it embarassing that most rap sucks though, because most music of any genre sucks and I defy anyone to prove otherwise. Just because a bunch of idiotic nincompoops think that all hip-hop/rap is "YO BITCH WHAT GONNA FUCK BUSS A CAP IN YO NIGGA" and don't consider it music doesn't mean that I'm going to go and hide the fact that I listen to it.
Also, I do listen to quite a bit of commerical rap, and I'm still not ashamed. It's my own damn personal preference. I own CDs by Nas, 2Pac, Jay-Z, and Twista, and there is NOTHING YOU CAN DO ABOUT IT! *laughs maniacally*
Admittedly, the lyrics can be shallow, the metaphors trite, and the messages repetitive to non-existent, but there are still things to enjoy about some commerical rap. I'm more into the "qualities" if you want to call them that, of the rapper's voice than the lyrics themselves. You can have the most socially conscious, mind-expanding rapper in the world, and if they flow like shit, I will not listen.