Well, as you know, the Iraqi Gov't is dominated by Shiites, and Kurds as well. There are some Sunnis as well, but they play the role of "archenemy friend" to the Gov't.
Recently, the Sunni bloc decided to boycott/withdraw from the Gov't. Of course, they have the Vice-President seat, as well as Deputy Prime Minister, in addition to about half-a-dozen Ministries, and 44 Parliament Seats.
As someone who is not convinced with what the Gov't have been doing for the past year (or let's say 2 years if we add the Jaafari Gov't era), I would hope, or let's say persuade myself that there must be a better alternative than what we currently have; however, with the Sunni bloc's "gimme gimme" attitude and their everlasting whining, i don't think that they are worthy of being a considerable opposition bloc.
Now there is also the Allawi bloc, but it is getting smaller in size and effect day by day, although the man was the choice of many Iraqi youth because of his secular attitude, which is still thought of as the best solution to Iraq's ongoing secular problems, or that is at least what his supporters say.
Well, as you can see, the (Shiite) Gov't goes smoochy with Iran; while the (Sunni) opposition goes smoochy with the Saudis; and all Iraqis are lost in the middle. There is no single face you could trust in today's Iraq.
Isn't it sarcastic that the "opposition's" members of Parliament get US$ 12000 per month from the Gov't, yet they curse it every day?! That is in addition to their army of bodyguards. Yes, those politicians who destroy Iraq have bodyguards, while Iraq's doctors, engineers, intellectuals, and youngsters are left to be killed on the streets, perhaps by the politicians' bodyguards and militias.