I've been using Debian for almost 3 weeks now-installed it various times on both my HP Pavillion a810n AMD Athlon64, and my Toshiba 7000CT laptop.
All installs were via the Debian-500-i386-netinst.iso found here-
(
http://www.debian.org/CD/netinst/ )
I chose netinstall mostly because I didn't want to burn multiple CD's.
The installs went smoothly for both computers, however I had one problem after the second FULL (I checked "desktop" and "base") install on my Desktop PC-after rebooting, I logged in, Gnome starts and a few moments later a window popped up saying-"kernel failure".
At first I thought it was a major error, as subsequent boots went the same way-everything would load fine-then the pop-up warning.
Nothing "crashed" or acted funny, so I re-installed anyway and haven't had further problems.
My purpose in wanting Debian at all was to see if I could get a very minimal install for the Toshiba laptop, which only has a 4GB HD and 160MB RAM.
I chose Debian Lenny, Slackware 12.2, GoblinX-2.7-Micro/Mini, Wolvix-Cub/Hunter, Crunchbang-Lite-8.04, and Puppy 4.1.2 in a "competition" to see which distro would give me the apps I need in the least amount of space-the catch being that each one had to be able to retain it's minimal footprint-but provide either the ability to easily compile packages from source and/or provide a Package manager with an extensive repository.
Out of all of them Debian Lenny and Slackware 12.2 are basically the winners-GoblinX and Wolvix only fell to second because they are based on 12.0, or 12.1 I believe. Because of this I could not include two apps needed-Gambas2 and Writer's World Maker.Both GoblinX/Wolvix are soon to release versions based on 12.2 Slackware.
Debian's strength's are it's package repositories and ease of use-these are also Slackware 12.2's strength's.
I only installed a minimal Debian system-that is when asked to install "desktop", "laptop", and "base" install-i unchecked all of them.
After installing and rebooting, I aptitude install-LXDE, and synaptic.
After adding Gambas2, WWMKR, and abiword-I had a fully working Debian install that ran fast and LXDE is nice! The install came up to 1.35 GB-which is small by today's standards.
I'm sure I could probably remove other things, or add anything i want.
So, in comparison, I think Debian is at the same level as Slackware 12.2. Both are the best of what Linux has to offer in terms of flexibility, packages, ease of use, and reliability.
I would rate Debian Lenny at a 10.