Slam poetry

Personally, I just don't get it. We were watching these YouTube videos about people doing slam poetry, and I'm just not feeling it. It's like, people shouting on a stage something which is absolutely not a poem, but prose. I might be too conservative, but I need the rhymes, I need the poem to "sound good", the meaning is not enough. If it doesn't look like a poem, or sound like a poem, then it's just not a poem. I don't see much difference between stand-up comedy and slam poetry on stage... I don't say it's not good, it's enjoyable, but it's nothing compared to the classic ones.