Some thoughts while I wait for my freshly installed base Arch system to upgrade heh. Beginner's guide is very nice and easy to follow, yet to install KDE:
1. Rolling release model may be nice but in Arch's own words, you are on the cutting/bleeding edge meaning even experienced users can screw up and trash their systems, no?
2. I guess you rely mostly on "upstream" software projects with no additional patches/fixes/testing like you get with the popular distros.
3. What about bug fixes and security updates? Again, rely on upstream? I doubt Arch quickly patches any bugs or security vulnerabilities...
4. It seems it will be a maintenance headache, requiring lots of effort/work on your part? Even the package management FAQ warns that you should take care and also watch for unwanted changes post install/upgrade...
There are only 2 reasons (IMHO) to stick with Arch if they are true:
1. You don't want to reinstall every 6 months to get a new distro even though you can also just upgrade, I prefer reinstalling them and it takes under 10 min anyway plus some short time configuring/customising.
2. You want the so-called speed. If Arch is not fast on my desktop I'll drop it fast.
Some advantages of distros like Ubuntu, Fedora, Mandriva over Arch and other rolling-release distros:
1. Early access to cutting edge experimental features like pulseaudio, fancy/fast-boot (KMS/Plymouth/splash etc).
2. Least maintenance workload - less command line work since GUIs are available for much.
3. Well and broadly tested so reduced chance of problems.
4. Fast security updates.
I'm sure I'll have more/different opinions since I plan to use Arch for next few weeks/months until Ubuntu Karmic 9.10 becomes stable enough to install...