I think the easiest way to install Adobe Acrobat Reader is via yum (as root):
rpm -Uvh http://linuxdownload.adobe.com/adobe-release/adobe-release-i386-1.0-1.noarch.rpm
yum install AdobeReader_enu
Yes, it will bring in some 32-bit library dependencies, but in my opinion it's worth it. As others here have mentioned, alternative PDF viewers don't always work with some PDFs. In addition to forms, I've seen Evince and Okular have other problems: handling transparency in embedded graphics, displaying colors properly, bad font susbstitution for non-embedded fonts.
I'd rather have something that works all the time instead of wasting time with those that don't. But for fun I like playing with GSPdf
every now and then: