Given that Hamas reportedly says it was targeting the Israeli Knesset building in Jerusalem, that it missed not just the parliament but the entire city by almost 20 miles doesn't suggest the most finely tuned aiming capabilities.
Still, the fact that Hamas is aiming at Jerusalem at all -- which Hamas also claims as the rightful Palestinian capital and which is surrounded by Palestinians, as well as Israelis -- seems significant, and could deepen Israeli concerns about the group's willingness to negotiate peace. It's also difficult to see how this could generate much sympathy among West Bank Palestinians.
Even though Hamas missed, it did manage to fire a rocket relatively far beyond Gaza. This map shows, roughly, the potential reach of Hamas rockets based on this strike. It's not far from Tel Aviv, which a Gaza-based rocket missed on Thursday.