Like everything else there are pros and cons. People tend to forget that we vote for our MPs and not the government. It is the elected MPs who select the government.
Question Period is a joke. Ed Broadment stated that it is not "Answer Period" so the government side can respond any way it wants to - even lying. The irony is that when pointing out the lie, the member who makes the accusation (although stating the truth) gets thrown out.
The interogation Mulroney sat through during the Mulroney-Schreiber Inquiry indicates how tough the questions really should be and how the respondant should not get away without giving a satisfactory answer without spin, hyperbole or attacks thrown back to the questioner.