You will have a hard time justifying C# as an ideal language for game developement because it is really not that special as a language.

The big plusses of C# is the Visual Studio IDE I guess and the whole .NET library. Also it is easy to learn, fast to code and powerful. You should study different sides of the VS IDE and read different articles about its good and bad sides to gather some information.

Yes, C# is a nice language that can be used as a domain specific language for many problem domains, including games. But the language itself (and most other) has no such domain specific features. It's more about the supporting frameworks, and how you use them, than the language itself.

You are approaching your article with a flawed concept to begin with, no language is ideal for game development in general, this is always subject to what you want to do and what platform you want to publish for, some games will best be written in action script, some games will best be written in C++, HTML5 is coming in hot, objective C is the native language of iOS platforms...

What C# combined with XNA is best for is entry level independent / small team developers that want to concentrate on making a game and publishing it while learning to program. If they didn't care much about programming they could go with game maker or similar frameworks, Unity presents a serious competition for XNA on its ease of use for new developers, plus it works on way too many more platforms than XNA and uses C# as well as java (and I think some more languages too)...

Without intention of offense, I get the impression you don't have the width of experience to write such an article, specially asking things like "there's such thing called the garbage collector which helps the trouble saving memory" and "And I remember hearing something about pointers too"

If this is a study assignment I would recommend you to do a deeper research than just forum fishing. Read on the properties of each language and understand what they mean, research which platforms they work well with and which tools are available that use each language... that sort of thing.

I didn't say XNA wasn't good for other stuff, I said that was its most important use.

The thing about publishing games with XNA that makes the public have a bad opinion as to its potential is that most people fall into the misconception that XNA is a game engine, its important to keep clear that it isn't and if you plan to do anything remotely complex you will need to get or make an engine.