Trump has won the popular vote in 20 contests representing 924 delegates, of which he has been allocated only 609, or 66%. The proportional voting rules based on congressional district performance have thus bled away 34% of his support in those races. Ted Cruz bled away 206 delegates from Trump in these states, 22% of the total.
Cruz has won the popular vote in only 9 contests representing 433 delegates, of which he has been allocated just 271, or 63%. The rules have thus bled away 37% of his support in those races. Donald Trump bled away 115 delegates from Cruz in these states, 27% of the total.
And, on average, 10% of the delegates legitimately owed to both Trump and Cruz have gone to candidates who have had no chance of winning whatsoever, and wouldn't be able to argue they have a chance of winning were it not for this insane way of proceeding which gives them the delegates to say so in the first place.
It doesn't seem fair to the voters in these 29 states that their candidates won the popular vote but didn't win all the delegates, as in winner take all, which will most certainly be the rule when the Republican nominee finally faces the Democrat in November.