Monte literally made us a playoff team for the first time in over a decade and a half with the Hali trade. I think he's doing alright.
I don’t think you can reasonably judge a persons trading ability with 1 trade over 1 years time period.
but even if you accept that was a very good trade which many still do not let’s look at Monte’s actions:
Pro:
Tyrese Haliburton, Buddy Hield, Tristan Thompson and a TPE were acquired by the Indiana Pacers from the Sacramento Kings in exchange for: Justin Holiday, Jeremy Lamb, Domantas Sabonis, a conditional 2023 2nd round pick (IND own) and a TPE.
Chris Duarte was acquired by the Sacramento Kings from the Indiana Pacers in exchange for: a 2028 2nd round pick (DAL own) and a 2030 2nd round pick (SAC own).
Kevin Huerter was acquired by the Sacramento Kings from the Atlanta Hawks in exchange for: Maurice Harkless, Justin Holiday, a conditional 2024 1st round pick (SAC own) and a TPE
Donte DiVincenzo (waived) , Josh Jackson (waived), Trey Lyles, the draft rights to Ilkan Karaman, the draft rights to David Michineau, a 2024 2nd round pick (SAC own) and a TPE were acquired by the Sacramento Kings in exchange for Marvin Bagley III, the draft rights to Vanja Marinkovic, a 2024 2nd round pick (POR own) and a TPE.
Nemanja Bjelica was acquired by the Miami Heat from the Sacramento Kings in exchange for: Maurice Harkless, Chris Silva and a TPE
A conditional 2022 2nd round pick (SAC own) and a TPE were acquired by the Los Angeles Clippers from the Sacramento Kings in exchange for: Mfiondu Kabengele, a conditional 2022 2nd round pick (ATL own) and cash.
Dewayne Dedmon, a More Favorable 2020 2nd round pick and a 2021 2nd round pick (MIA own) were acquired by the Atlanta Hawks from the Sacramento Kings in exchange for: Alex Len, Jabari Parker and a TPE
Con:
The draft rights to Dimitrios Agravanis and a TPE were acquired by the Milwaukee Bucks from the Sacramento Kings in exchange for: Robin Lopez and
cash.
The draft rights to Luka Mitrovic and a TPE were acquired by the Los Angeles Clippers from the Sacramento Kings in exchange for: Filip Petrusev and
cash.
Richaun Holmes and the draft rights to Olivier-Maxence Prosper were acquired by the Dallas Mavericks from the Sacramento Kings in exchange for:
cash and a TPE.
Tristan Thompson was acquired by the Sacramento Kings in exchange for Delon Wright. Delon Wright and a TPE were acquired by the Atlanta Hawks in exchange for Kris Dunn, Bruno Fernando and a 2023 2nd round pick (POR own). Kris Dunn, Bruno Fernando, a 2023 2nd round pick (POR own) and a TPE were acquired by the Boston Celtics in exchange for Tristan Thompson and multiple TPEs.
Delon Wright and a TPE were acquired by the Sacramento Kings from the Detroit Pistons in exchange for: Cory Joseph, a 2021 2nd round pick (LAL own) and a 2024 2nd round pick (SAC own).
Terence Davis was acquired by the Sacramento Kings from the Toronto Raptors in exchange for: a 2021 2nd round pick (MEM own) and a TPE.
Bogdan Bogdanovic, previously with the Sacramento Kings, became a free agent
The draft rights to Robert Woodard II was acquired by the Sacramento Kings from the Memphis Grizzlies in exchange for: the draft rights to Xavier Tillman, Sr. and a Swap 2022 2nd round picks.
not trading Barnes to Boston for Aaron Nesmith and a first. And yes I know for a fact this trade was on the table.
Unknown
The draft rights to Colby Jones was acquired by the Sacramento Kings from the Boston Celtics in exchange for: the draft rights to Jordan Walsh and a 2024 2nd round pick (DAL own).
The draft rights to David Michineau and a TPE were acquired by the Brooklyn Nets from the Sacramento Kings in exchange for: Kessler Edwards and cash.