This summer, MTA-NYC Transit instituted a Rider Report Card, distributing both at subway stations and online. The first Rider Report Card was distributed for the #7 line; MTA-NYCT just announced that the L line is next in line.
However, if you visit the MTA-NYC Transit website, you can complete an online Rider Report Card for the G train, as well as all of the other subway lines. (In multiple languages, no less.) Go for it!
Our only beef is that when you're asked to indicate which subway station from which you typically board the G, only half the route is offered in the drop-down menu - yet more evidence that the MTA would love to permanently halve the line and make the final northbound stop Court Square Station.
Last: if you haven't taken our own straw poll, please do so. It's got some items that are not included on the Rider Report Card - like the possibility of extending G service farther south into Brooklyn.