1) What? There is so much documentation both installed and all over the internet I find it a little difficult to believe you are saying that.
2) I'll take your word on that one.
3) Linux doesn't have anything like the kind of gaming experience you can easily get from Windows.
4) Personally I use the command line a lot, on many of my machines it's the only option. However, if you do have a graphical environment installed obligatory use of the command line is quite rare and it is much better than the windows one.
5) I can't see how this is a downside. It's there if you need/want it but using it isn't compulsory.