What are two of Brutus's admirable qualities in Julius Caesar?

Brutus is patriotic and thoughtful.

Brutus has many negative qualities. He is naïve and betrays his friend, and he does not back down and let people who know better than he does take charge. However, there are some positive aspects of the man.

The first positive trait for Brutus is that he loves his country. He is actually willing to set aside his love for a friend because he loves Rome more. He considers Caesar a threat, and since Rome is more important to him than Caesar, he is willing to kill Caesar for Rome’s sake.

Brutus is considered noble and honorable by most of the other senators. This is why Cassius seeks him out in the first place, to see how he feels about the prospect of Caesar as king.

BRUTUS

What means this shouting? I do fear, the people
Choose Caesar for their king.

CASSIUS

Ay, do you fear it?
Then must I think you would not have it so.

BRUTUS

I would not, Cassius; yet I love him well. (Act 1, Scene 2)

Brutus does not take the position lightly. He is actually very thoughtful about such an important decision. Once he is back home, he ponders his role in the assassination. Brutus decides that Caesar is too dangerous to be left alive, and that he has to die for the good of Rome.

Brutus is concerned about their reputation, though. He is thoughtful and careful. Some of the others want to kill more people than just Caesar, but Brutus cautions them against it. He is worried about how they will look to the people if they kill anyone else, especially Mark Antony.

Let us be sacrificers, but not butchers, Caius.
We all stand up against the spirit of Caesar;
And in the spirit of men there is no blood:
O, that we then could come by Caesar's spirit,
And not dismember Caesar! But, alas,
Caesar must bleed for it! And, gentle friends,
Let's kill him boldly, but not wrathfully … (Act 2, Scene 2)

Brutus obviously does not know Antony well enough to realize how dangerous he is. By leaving Antony alive, Brutus leaves a big wrinkle in their plans. Antony is more cunning and persuasive than Brutus ever thought. Appearances mean more to him than anything else, and he wants the people to view them as liberators and not murderers. For this reason, he leaves Antony alive and even allows him to speak for Caesar at the funeral.