If the operator is somehow involved in the league organization as the original post suggests, I absolutely expect the games to be operating 100% at the start of a match. Regarding leagues involving locations with offsite operators, the expectations are certainly lower but I do expect a majority of game features to operate within reason. Issues will always come up during play that may occasionally disqualify or change the dynamics of a game, but unless it's the same issue occurring week after week with half-assed patchwork fixes, I think most players are understanding. That said, I think players are certainly aware and take note of the condition of machines and responses of operators, and their success as a venue and coin drop on non-league nights reflects this.
Personally, when I go out to play, I will only go to a location with an on-site operator or tech because I know those locations are well taken care of and capably managed. Too often where I live locations with 1-4 games are poorly maintained with issues that make dropping a dollar in the game a gamble. In the finals of our bar league last season our teams had to reschedule our match because all four games at our play location had some game-breaking issue that disqualified it from play. Some were as simple as (multiple) stuck balls, but without someone on site to open the game or make a quick adjustment, there isn't much that players can do to correct the issue.