Not a bad one, although as it was early for Trek books, it took a few liberties here and there. "First Frontier" is definitely a fun one, I enjoyed that.
Don't listen to your 'unnamed sources', there is a LOT of fun to be had in the numbered books. Not as tight, continuity-wise, as the new books (in fact, they often contradict, unless the 5YM was about 40 years, and Kirk was a bigger menace to the timeline than even hinted at in DS9), but each story by itself works well. Some stinkers as well, but plenty of good stuff there.
Don't listen to your 'unnamed sources', there is a LOT of fun to be had in the numbered books. Not as tight, continuity-wise, as the new books (in fact, they often contradict, unless the 5YM was about 40 years, and Kirk was a bigger menace to the timeline than even hinted at in DS9), but each story by itself works well. Some stinkers as well, but plenty of good stuff there.