Siel itself sensationally good - playability with risk for Steam Server

I constantly install programs, including games from various providers. Here it worked not the first time:
In this game came about a long time regardless of operating system (XP, Win7, Linux) the message (after a long installation process) that from 27% display temporarily not be reached on Steam download the Steam server.
Even later, there were times with an unreachable server.
Note: Apparently, however, the article may not be exchanged.
-> Whether this is due to steam or to the Game Software, I have the negative, because the manufacturer has already take care that the game is also playable. Just come with negative reviews, the game maker (hopefully) to the extent that they consider as something else.
-> The game itself is excellent. There are however enough reviews and ratings outside of Amazon. Therefore 2-3 stars are justified.
-> And first: I realize that this is still a point of contention whether the game even if it is running and is playable is to evaluate, or articles in my - in my opinion, has as usual the product as a whole in its applicability and handling are evaluated. Even if there had bugs or crashes would produce would have to be rated, even if the game itself then is still so great.