MAVS NEWS:

[F Gump]

Well once upon a time the worst pick in Mavs history.
Then there was Randy White, Samaki Walker, and Cherokee Parks to name a slew

I think Garnett was the worst, as well as the first, of those awful 1st-round selections by the Mavs, especially since he was such a high pick and it was a young team with lots of minutes available to a player who could play decently.

But all the ones you named were pretty bad choices, and there were many more 1st rounders they selected that were sucky as well. It would probably be way easier (and a much shorter list) to name the ones who turned out good, rather than the ones who were a whiff. (To me, the worst whiff, by a lot, was Larkin over Giannis. Ugh.)