But of course you are entitled to your opinion.
Drivers....
"Drivers just don't exist for many peripherals, both old and new,"
Like most all FUD, it is not necessarily completely untrue, but out of context and over hyped. I have never liked the idea of "driver loaded firmware" and consider it a excuse or device for exclusivity, obsolescence, software patents and/or some other monetary confabulation. What ever happened to things like HAL, Plug~n~Play or even BIOS/EFI. Imagine attaching a standard device, a drive or memory for example and not having it be recognised, irrespective of whatever OS.
From my experience I generally have had less problems with drivers for Linux than with the various iterations of Windows. Printers, scanners, cameras, flash, monitors, Ethernet, video, TV/capture cards, Drives etc, etc. Both my old and new hardware & peripherals all work usually the first time, without having hunt down drivers.
But there are issues with some hardware & Linux but that is more the fault of the ODM/OEM. The ones that are limited to only Windows I consider defective and would not purchase. I would also point out the ones that have no difficulty with Linux also usually have no or less difficulty with Windows, Mac & others as well.
I do agree with you, that the ones that can most quickly utilise Linux are those at the opposite ends of the user spectrum. As they are less influenced by the marketing, FUD & Dogma. The casual/general user see's the computer as a tool/appliance and to them the nuts~n~bolts are equally Greek or Geek. The pro/enthusiast knows the fundamentals & understands the concepts and can utilise what it has to offer, it is the same 1's & 0's.
I am guessing you are refering to the Dell Precision T3400. I have used Precision workstations in the past and do not have experience with this model, but do have to wonder as Linux (Red Hat Enterprise) is available as a choice of OS.
You do seem to be having many issues, and I am sorry you are. It may not be worth your interest/time to overcome/correct them. It can also be worthwhile if you are interested in expanding your awareness/understanding of computers.
Even as with Windows some set-ups require the need to download & configure/reconfigure for optimum usage, although in most cases it is more automatic or wizard driven, it still needs to be done on occasion. And again as in Windows when you run in to and correct an issue you develop an understanding and it can become second nature to solve the next time.
Have you only tried Ubuntu? I say this not to preference one distro over another (Ubuntu is a great distro & seems to be the most popular) but just to see/compare
various liveCD/DVD's how they recognise & configure. After all they are all free. Other ones to look at Linux Mint, Mepis, Knoppix, Parsix, and others these are all Debian/Ubuntu based.
If interested check out
http://distrowatch.com/ they some great sections major distros, search section, news etc.
One old trick when booting from a liveCD is to turn off ACPI in bios or load with the no ACPI option. As there are two main specs(scripts) for ACPI, MS & Intel guess which one sometimes has more difficulty.
You can compare (and sometimes even copy) a working /etc/xorg.conf file. that is where several if not many of the issues you have can be corrected. usb/ps2, Xinerama or appropriate ATI driver for multiple monitors, appropriate specs frequency range etc.
If you have one of the better/pro video cards FireGL/Quadro can't see why your having any issue, as there are/were good drivers both Open source & prop and things should be more automatic.
http://www.dell.com/us/en/enterprise/desktops/precn_t3400/pd.aspx?refid=precn_t3400&cs=555&s=bizWhile all systems have their qualities; Advantages/shortcomings I am not sure anything you mentioned is the fault of Linux... as much as the ODM/OEM and the attitude/awareness/perception/understanding of the user.
Anyway sorry you are having issues, could all be hardware, if you have a real interest, it is (can be) worthwhile, (fun, educational, profitable) just as solving Windows issues........