Describe your first impressions of Macduff.(Macbeth)

It is true that we do not actually see Macduff until Act
II, scene 3 where he plays straight man to the Porter.  It is Macduff who discovers
Duncan's body and announces this information to the rest of the people gathered.   The
news he must give them is so horrible that he cannot just say that the king is dead. 
Instead, he says, "Confusion now hath made his masterpiece./Most sacrilegious murder
hath broke ope/The Lord's anointed temple and stole thence/The life of the building." 
This metaphor conveys the magnitude of what has
happened.

He does not seem to accept what then transpires
and instead of going to the coronation of Macbeth, he goes back to his home,
Fife.

I contend, however, that we hear about what a valiant
and great battle commander Macduff is in Act I, scene 1.  After hearing in graphic
detail Macbeth's actions on the battlefield, another man appears with a report.  That
man is Ross, a kinsman of Macduff.  When asked from which battle he has come, he informs
the king that he is from Fife.  Who is the Thane of Fife?  Macduff.  Ross then goes on
to tell about the attack of the Norwegian king and how Ballona's bridegroom confronted
the traitorous Thane of Cawdor and subdued him in
battle.

Just about every editor of
Macbeth has identified in a footnote that Ballona's bridegroom is
Macbeth.  This makes absolutely no sense whatsoever.   Ask yourself, why would Macduff,
the Thane of Fife, give over command of his troops to another thane, Macbeth?  Both
being Thanes, they are of equal rank.  And just how did Macbeth get to Fife from his
battlefield further south?  Why does Macbeth NOT know of the defection of the Thane of
Cawdor if he had just fought with him in a battle?  Shakespeare's audiences would have
easily made the connection that the reference to Fife meant that Ross was talking about
Macduff, his kinsman, not Macbeth who was at an entirely different
battlefield.

Shakespeare, in the very first scene of the
play, was setting up the two men, Macbeth and Macduff as protagonist and antagonist and
setting up the final confrontation.  By mistakenly identifying Ballona's bridegroom as
Macbeth, the balance Shakespeare intention has been
thwarted.

So, in answer to the question, for me, my first
impression of Macduff comes from the information Ross gives in I, 1 and I see a valiant
battle commander who successfully defeats the Norwegian forces and captures the
traitor.

One may ask why Duncan rewards Macbeth with the
Thane of Cawdor's lands and title.  The answer is quite simple.  He saved Malcom's
life.

It must be remembered that Shakespeare wrote for the
theatre.  Editors, for the most part, are scholars and not actors or directors, so what
might make sense to a theatre person may not make sense to a scholar and it is scholars
who edit Shakespeare.