I've never owned hydros myself, but I've been on plenty of rides where hydros have failed somebody due to:
1) air somehow gets into the system so the brake ceases to work
2) slightly bent rotor pushes the pads apart so the brake ceases to work
3) somebody mistakenly pulls a brake lever during a tire change, and the pads close so that the rotor will no long fit, leading to much cursing while trying to pry them apart.
Been running and loving BB7 since before they were called BB7 (BBDB).
I use 1 finger on the brakes, and always have more than enough stopping power.
Never had a problem or known of anyone having a problem with BB7's.
That's "better" to me.