Back when that tactic was standard practice, we had Bill Gates and Steve Ballmer in charge of the company. Both have since stepped down (BG is now the technology advisor, but not in charge of the business strategy of the company). I'm not saying that Microsoft has definitely changed, but I'm willing to give them the benefit of the doubt for now.
I also give instructions on setting up the same desktop in a blog post: http://certainthought.blogspot.com/2011/07/simple-linux-desktop.html
I've played a number of MMORPGs. I've found that most of them make grinding a part of the game. There's some strategy, but it starts to look pretty shallow about 100 missions in or so. You get stuff, but you're limited to which stuff you can use based on choices you made at the beginning of your game. The map is pretty static; nothing really changes unless the developers decide to change something on the map, and any player- or team-owned locations are more likely than not to be instances rather than part of the standard world map.
In this game, there is far less grinding for money or skill, which means that the playing can be done for other reasons; and with the corporation/alliance structures, as well as the ability to control star systems in nullsec (or lowsec, depending on how you roll), there are some definite benefits to play that won't involve grinding, but still include doing stuff.
Now, in terms of thinking, this could allow other people to intentionally, uncontrollably interrupt my thoughts without first having direct physical access to me. I don't know about you guys, but I rely heavily on continuous thought, and can't do squat with discrete thought (think long-term focus vs. multitasking). Having an interface that can interrupt my thought process by another would be a bad thing. It might not be so bad if the wire could be pulled, but if the work being done needs information pulled from remote locations, it can be a very risky proposition.
Additionally, even now, people can operate with incorrect thoughts, but they are acquired through the normal inputs and outputs, and must pass through a reason filter in order to be integrated into the mind. The idea of there being a way to bypass that filter scares me to no end; imagine someone being able to plant a suggestion, telling you to do anything they want you to do. Maybe you'd still have the presence of mind to resist stuff you wouldn't normally do, but I've done enough technical work to know that not everybody has this presence of mind, especially when threats or enticements are used ("your computer is infected, download a security upgrade to fix," vs. "You have won $1,000,000, please provide your bank information to have it transferred to your account"). Believe me, it's not just the savvy that would want such an implant.
Next, action. Our minds determine what actions we will take, even if most of the steps are handled by nerve-based autonomous processes known as reflex (you don't have to consciously think about how to walk, you just walk). If I were to be rendered unconcious, so that an attacker could make use of my body, there's no telling how law would apply; I was unconscious at the time, I performed the action, but someone else is responsible. And that's not taking into account...
The health aspects of such a thing is probably the most frightening thing about having such a device in the mind. Every part of the human body has some basic activity that can be harmful if it stopped, even for a short time. A healthy nervous system allows the proper timing signals to be received by the involuntary muscles in the body including heart, lungs, and digestive tract. Without these, neither nutrients nor oxygen would make it to the cellular tissue, especially the muscles themselves. The body would break down, eventually dying as a result.
We do have diseases, but right now, they are limited to physical infections which are localized, and usually contained and expelled by a healthy immune system (autoimmune diseases notwithstanding). Having a direct access to the brain, however, opens up the risk for a much more dangerous form of infection; imagine some really antisocial people coming up with a virus program that can alter the signals going to the heart muscles, such as, say stopping the heart, or maybe increasing the rate to even more dangerous levels. Imagine something that can force the adrenal glands to keep producing. Or perhaps stop the pancreas, inducing a state of diabetes in anyone. Or perhaps disable dopamine production, leading to a number of frightening diseases.
The point is this, if you set your brain up to be affected by computers, then it'll be just as well-protected as any computer is against attack. And unlike a computer, this cannot easily be reformatted, nor can an alternative OS be installed... at least, not without you no longer being you.
6 Curses = 1 Hexahex