The Steinsgate VN starts off very slow and stays very slow for quite some time. I also found it tedious. Fortunately there are hundreds (thousands) of other VNs to choose from.
It's unfortunate that VNs are both a medium and a genre. For reasons I don't quite understand, I adore the medium. Yet there are genre conventions that I dislike and that new readers generally can't tolerate.
Maybe I'll get around to trying one of the others you mentioned in a different comment. :)