Absolutely, for two reasons.
First, Parliament has an opinion. Of course, you're here because you have an opinion. You're here because you represent the opinions of the citizens who elected you. There is no guarantee that the government is all knowing, and has everything right.
You're entitled to express your opinion. If you say, instead of spending all the money over there, why don't you put some of it over here, if that is your opinion and it's reasoned and rational, the government might listen to you.
At the same time, also, by knowing that you have this authority to move money, or to recommend that money be moved—not be spent here but spent there—it gives you the incentive to look at the information knowing that your contribution can count.
If you know that your contribution can't count, if you're just going to get batted away, then, as I say, sometimes if people have no responsibility they act irresponsibly. That feeds the partisanship. But if you have this authority and this capacity, there is no doubt in my mind that you will accept it, and deal with it professionally, and make a contribution to the country.