To me ANIS is one of the better episodes which showcases Archer's development.
Here we had a series with a captain that was not polished by any stretch of the imagination. He certainly was no Kirk or Picard. But that was the point. Kirk didn't spring from the Academy as the hero we all encountered in TOS, no matter how much JJ Abrams wants him to be so.

He had to grow as a human and as a commander before we ever met him. When we first saw him on TOS he was already a polished gem of a captain. The same thing happened with Picard. He had a long career in Starfleet before TNG ever started. He had spent years honing and developing his diplomatic and command skills before we ever met him. He even had to lose a starship to become the man we met. The same was true for Janeway and, to a lesser extent, Sisko, who did grow as a commander throughout DS9. However, with ENT, we started out with a captain who was completely "unprepared" for the job of commanding a starship. We had to watch him grow as a leader and as a man as the show went along.
By season four, I believe the growth was pretty much to where people expected it to be. He's now very much the typical "Star Trek captain," albight with his own quirks. However, for the first three seasons he was basically just a guy stumbling along in the dark and learning on the job. Episodes like ANIS show this perfectly, IMO.
Now, that all being said, I think there are two major problems with this aspect of the show. 1.) The writers inability, or lack of interest, in showing this development consistently. And, let's face it, it all is rather forgettable. 2.) Fans came to the series, from the beginning, expecting to see another captain in the mold they were used to and were upset when they didn't get that.
Would Kirk, Picard, Sisko, or Janeway have taken their pet on a diplomatic mission with a species known to be easily offended? Of course not. They know better because they have the training and/or experience that tells them not to. Would Archer do it? Of course he would, because he doesn't know any better at this point in his career.
Does this mean he's not a hero who would go on to be an utterly pivotal player in the founding of the Federation? No. It just shows that he wasn't born with the ability to do great, world-shaping things without even trying.
Earlier I said that someone like George Washington would probably seem deeply flawed if we actually met him. Well, I think that's true. Did you know that in the only time he commanded troops before being named as the Commander in Chief of the Continential Army he screwed his mission up so drastically that he basically started the French and Indian War? Does that failure mean he didn't go on to do world-shaping things? Of course not.
Damn, I'm really talking Archer up here. Oh well, those are my thoughts.