Honestly depends if I trust the developer not to abandon. They are among the best and most memorable games if done well, but there's always the anxiety that I will see the abandoned tag sooner or later
Depends on the set up, but nothing more annoying than when new side characters just randomly appear to take up valuable content for several updates simply to delay progress with the main LIs.
Probably often to do with overly high expectations of how much money they'll make quickly, and the reality hitting motivation to continue to put out quality content.
A good story that builds anticipation but then actually delivers is easily my favorite type of VN.
Problem is the amount of games that get abandoned before reaching this point