Ranked in these QuestionsQuestion Ranking
Pro Part of LSB
It is part of the Linux standard base.
Pro Very easy to create packages
It is very easy to create packages for it, you just need a small spec file.
Pro Standard archives
RPM packages are simple cpio archives that have additional compression support.
Con No interaction
RPM does not support user interaction upon install.
Con Many forks
Currently there exist rpmv4, rpmv5 and distribution specific forks like Mandrake's urpm.