From issue #9 of Television Chronicles (April, 1997):
"If there was a season that did everything right, the fifth year was it. Characters unveil more of their souls than ever before."
I disagree with the "a season that did everything right" part, but agree with the characters getting better Episodes like All For One, Mac's Back, and Echoes of the Mind all feature great examples of the four guys and their growing relationship. However, those are the only truly great episodes of that year, though there are still some decent moments spread throughout the season.
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"Popularity is the pocket change of history."
~Tom Selleck