I really like a lot of things about Solaris. I dislike a lot of things about it too.. namely, automated installs are annoying (even with JumpStart), and rpm+yum is far superior from a user standpoint than Sun's package -> patchid + 8000 different patch management tools. pca is the closest thing out there to a simple way to see what should be applied to your system, but just not quite the same.
the new IPS package manager is okay. Doing image-updates has reasonably worked well too.