I have to agree with Happycat.
What I missed on the website were the system requirements (e. g. on the page "About").
One of the first things I search for when gathering information about a game that interests me, because I'm not the type of guy who thinks "the most essential way of living is keeping your PC up to date".
Even if they are pretty low, I think they should be there. (Or did I just not see them?)
And then I was irritated by the different versions of the game provided by the different places you can buy it. I have downloaded a version of a different place than where I later bought it. It said me "Invalid Activation Key" and I thought it's just waiting for the money transfer to complete. I try-and-error-ed a different client and luckily it was not an error.
The thing with different versions from differnt places and so on should
really be made clear on the website.
Everything else is just fine.

all generalisations are false.