Krzanich and Swan were catastrophically bad. Both of them are among the worst bigcorp CEOs ever, with asleep-at-the-wheel Krzanich in the running for the worst of all time. Intel's board tried to right the ship with Gelsinger, but it was too little and too late, especially given slow development cycles in the semiconductor industry.
It's arguably a challenge to supplant Jack Welch as "worst of all time" after he not only ran GE into the ground, but also started the whole "celebrity CEO" fad and spewed a bunch of toxic crap that poisoned scads of other companies. Rank-and-yank being first among those.
