Depends on how you look at it. My first one got RROD, and while I was waiting for them to send me a new one I said "fuck it" and bought an Elite, then when my replacement arrived I swapped it for an older one with a buddy so that he had a newer one* and I could just sell his old one. Then my Elite got the RROD, and I'm now on my second shiny black system. So while I voted 3, it could just as easily be counted as 5.
*Funny story about this, I switched with him because we figured the newer console would last longer then his old one. Not two weeks after the swap, the new one got RROD. Apparently the customer service lady that he talked to on the phone thought it was a little fishy that he was sending in a 360 that was supposed to belong to me. He somehow avoided theft charges by telling her that I had cancer and was giving all my shit away. Thank God for Microsoft tech support people that just don't care about anything.