I don't want to derail the thread with linux discussion. Thus will post this and will stop unless someone grossly misinterpret me or needs more info.
1) Share market is not 2%, but about 10% on the desktop. Several sites explain how that marketing 1--2% figure is fabricated by giving more weight to American sites than European or by using other statistic tricks.
I manage statistics from my own site and last month 10.9% of users have linux installed. I find interesting that market share that I can measure agrees with the with official claims from linux experts.
Steam shows a low market share because of the lack of native games for linux.
This is all for desktop, where linux has the smaller share. If one counts phone/tablet and other markets then number of linux users is very superior to windows users. About 3:1 or something as that. In supercomputers and other serious stuff linux has about 99% of market share and windows is almost inexistent.
2) If your WIFI or any other hardware doesn't work the problem is the hardware-maker, not the OS. It is the hardware-maker who makes the drivers for the OSs. Some only make drivers for Windows, but this is a special case. Linux detects automatically over 90% of modern hardware.
In my case, my linux distro did detect automatically any hardware and even did detect automatically my network settings. With Windows I have to download drivers from hardware-maker site or install from a given CD/DVD. I have to install special program to access to network and have to configure the settings by myself.
I don't need to install and configure antivirus or firewalls.
3) Linux is customization. I can replicate Windows 7 desktop. Or I can replicate Apple OSX desktop or I can do a complete different desktop adapted to my needs and that nobody else has. Or I can eliminate the desktop and work only with a windows manager. Or I can load a tiling window manager the mondays and Fridays an a windows-like desktop the rest of days.
Next photos are from same ubuntu but with different desktops: unity, KDE, XFCE, gnome3,...
Of course, each one of those is configurable as well. This is a XFCE desktop modified by the user
Here one linux desktop modified to look as Mac OS
Configuration is almost infinity. I can eliminate the buttons from the windows or add more, move them from right to left or just make the windows borderless and pseudo-transparent... I can configure other things as well. I can do a tiny linux OS that loads only on RAM and is superfast. I can do one that only uses keyboard and no mouse to manage the windows. I can do one with tons of fancy stuff just to see windows user astonished with desktop visual effects. I can do a live USB and port my linux OS to any computer, using it without install...
4) Installing a program from outside the software center is so simple as downloading the deb archive (for Debian based distros such as Ubuntu or Mint) from some site or using a CD/DVD/USB, click on the deb archive and select install. The rest is automatic. With internet on, the own OS will search and download needed additional packages if are needed.