Are you serious?

No Block or Better
50% dead head
SSHHIITTYY cancellation pay that turns into no pay at all
No trip or duty rigs
No daily guarantees
Mandatory JR manning
8 days off for reserves
Majority of pilots only get 10 days off
$1.25 per Diem
1 hotel room on some CDO's
Don't ask of time off, you won’t get it and if you call in sick you'll have to visit your CP
Freedom "A"

And Orenstein at the helm, this is the guy who said "as long as there are resumes on my desk, pilots are overpaid." Also keep in mind that Orenstein has a criminal history and is currently being investigated. He also duped Hawaiian into opening the books, then shortly after he started Go!. Hawiian filed suit and now Mesa has to pay $80M plus fees and he’s one of the reasons that Aloha is folding.

Other’s can probably go deeper but that’s a few highlights.

BTW, its not Mesa that's hated, its Orenstein!