Just remember, in the OP s0me0nesmind1 said "You might not have liked the press secretaries of Trump, GWB, etc... or what they said, but they simply were never this incompetent."
Shawn Spicer - one of his goals as press secretary was to present the "caring and gracious" side of Trump to the public. Started out by lying saying the Trump inauguration drew the largest audience to witness an inauguration. Spicer then added that his intention was to never lie to the press. After he left the post he admitted screwing up often while in that job.
Sarah Sanders - lied a lot to the press. Notably that the "president in no way, form or fashion has ever promoted or encouraged violence." While interviewed by the Mueller Special Counsel investigation, she admitted to investigators that she had made false statements to the public as press secretary. Probably would have been worse if she hadn't pretty much stopped having press briefings.
Stephanie Grisham - what can I say. She held no press briefings during her almost a year in the post. At least she wasn't lying on a daily basis. I have no idea what, if anything, she was doing.
Kayleigh McEnany - in her 1st press briefing she promised not to lie, and then did little else. There isn't a lot more that can be said about her.
According to s0me0nesmind1, Jen Psaki's horrible incompetence seems to lie in the fact that she says "I'll Circle Back." And that makes her WORSE than all of the above.
'nuff said.