Ten years ago, applications might have mattered. They still do.
However, OpenOffice (or whatever it is called today) is IMHO superior to Microsoft Office. That's fine for your opinion. Unfortunately, your opinion is solidly in the minority and you need to do more than just scream "IMHO THIS IS SUPERIOR" to get people to switch. WHY is it superior? WHAT makes it a better, more user-friendly program? WHAT can it do that MS Office can't?
Office imho is likely to become mostly obsolete, much like the desktop. I don't even bother with libre office and just use google docs. The desktop and Office will probably always be around for the minority who can't live without it. Anyways doc creation is headed for the cloud as a free feature for most people.
Gimp and Inkscape are great drawing programs. Great. I can run GIMP on Windows just fine. I can also use Paint.Net. Or any of a number of other programs. Including, if I care to shell out $50, Adobe Photoshop Elements.
Casual games tend to be cross-platform while hard-core games don't universally work on Windows anyway - this is what a game platform is for.
Actually, Windows is the platform to target for hardcore games, they don't target OSX.
Drawing programs are a dime a dozen, and Gimp is an also ran.
The printer "just works" without any need for the user to fuss with drivers. Until it doesn't, and then you're up shit creek without a paddle, likely to find some Linuxite telling you "STFU Noob, ur printerz not supprted, go buy a diffrent printer nstead."
That may have been true 10 years ago, and yes I was daily user then and still am. However, I seriously haven't had anything else but plug and play printing via usb for at least 5 years. I've only used hp printers, and have had drivers pre-installed every time. HP seems to have done well here.
The good tax programs are all web-based now. Sure, until you get into filing anything more than the 1040EZ.
This has been in the cloud for 10 years and is more so every day. Much like the desktop, how many need more is a small minority.
Sharepoint - seriously? - does anyone use that pile of crap? You're not going to get people to switch to your alternative - wait, what was your alternative anyways? - just by calling their current solution a "pile of crap."
Sharepoint is in the cloud, works fine on Linux and firefox - I use it daily.
Most importantly, videos and music plays without a fuss. Some of the time, other times not. Which is a lot like OSX and Windows come to think of it. Best experience I've had with video is running Windows with VLC 2.0.1 installed.
I have yet to find a file in 10 years that mplayer cannot play. Seriously. That must be one of the most flexible players on any system anywhere.
NFS networking actually works all the time, unlike tempermental CIFS. Right until you try to interact with OSX or Windows boxes.
OSX is based on Unix, Samba has never let me down.
There are no virus worries. Because so few people on the planet use Linux as their desktop that no sane virus writer would even bother. Get yourself any appreciable market share and watch that change in a nanosecond.
And Linux is so much simpler to use than Windows. Bullshit.
I've seen the argument made before and it doesn't make sense to me. I suggest having root separation and such a wide variety of distros make narrow targets. I have seen server worms from Java, but that's not a Linux only problem.