I will try to be succinct and not put too many numbers in here, but I'm bored all the time now so I did some research and I feel confident in saying the loss to Abilene Christian was the second worst loss in NCAA Tournament history only behind Virginia losing to UMBC and that's ONLY because that was a 1-16 game. UMBC played a hell of a lot better against Virginia than ACU did Texas.
Since the field expanded to 64 in 1985 there have been 32 upsets by 14, 15 and 16 seeds. Of the 32 winners ACU had
- The worst FG percentage (29.9)
- The second fewest field goals (20)
- Tied for the second fewest 3pt FG (3)
- Tied for third word 3pt FG percentage (16.7)
Of the three other teams as bad or worse from three, ACU had the lowest 2pt FG percentage by far. The only team with fewer made field goals was Stephen F Austin against WVU in 2016 and they hit seven threes and took 13 fewer shots.
Furthermore, if you look at ACU's analytics profile their strengths were turnover pct (1st in the nation), effective FG pct defense (17th in the nation) and were a modest offensive rebounding team (74th in the country) which is actually pretty impressive considering they're legit one of the smallest teams in the country.
Basically, ACU played exactly the way you'd expect them to play and any coaching staff worth a shit would've had their team ready to play and Shaka didn't. ACU played like shit in that game. Texas played slightly worse.
TL;DR - Abilene Christian sucks and Shaka Smart sucks worse.