A solid Monday puzzle. Simple theme, well-executed. What sets this apart, however, is that the theme density is quite high, but Mr. McCoy, whose name I have come to associate with solid construction, works around tight constraints to produce a pretty smooth result. A little WORSTS (5D: Opposite of bests) here, a little ENT (62A: Suffix with differ) there, but overall, nothing too CHAFING.
Aside from the theme, I enjoyed HITORMISS (9D: Sometimes good, sometimes bad), MOXIE (11D: Gumption) (Excellent clue.), CROOK (6D: No-good thief), and even SPEEDO (12A: Swim meet coverage?). Hah!
1A: STRAW (Building material for the first little pig) - B+. Fine word, very good clue.
Favorite: 57D: Like some library books and babies (DUE)
Runner-up: 37A: "Mmm-hmm, mmm-hmm" (ISEE)
There was no least favorite. That's just how it was today. I enjoyed the clueing, I enjoyed the puzzle. Nice start to the week!