Most people are probably smarter than me, but when I downloaded the Cyanogenmod Alpha the other day, I thought I was downloading a zip file, but it was actually just a link to one of the download sites that contained the zip file. I had done a right-click on one of the file links, thinking it was directly linked to the zip (but it wasn't). I tried to install a ROM based off the "zip" files and they obviously gave me an error. Once I downloaded the correct files, it worked like a charm.
Wiped data, cache, dalvik, then flashed ROM, kernel and Gapps, and it worked like a charm. I liked it, but I hated not having a 4G indicator and only having 5 app screens vs 7 with a Sense based ROM.